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7/23/2019 Electromagnetic Compatibility EMC Components and Gaskets for RFI EMIShielding
sealing solutionsKemtron, a leading company in EMC shielding andenvironmental sealing since 1980, works with bluechip customers in more than 35 countries aroundthe world. We have developed a global reputationfor quality, performance and reliability, with anenviable track record in demanding industries suchas defence, aerospace, information technology,communications and electronics.
We help customers meet their EMC shieldingand environmental sealing requirements withinnovative solutions that enhance product
performance, reduce through-life costs and ensureregulatory conformance.
Our fully-equipped manufacturing and warehousefacility at Braintree in Essex has the flexibility toproduce short-run bespoke solutions as well asstandard products in volume. With in-house design,development, engineering and manufacturingcapability, we maintain control over the entireproduction process to ensure the highest levels ofquality and reliability.
Financial stability Kemtron is an independent, financially-stable
company with a healthy balance sheet and a clearmarket focus. Our five-year strategic plan providesa comprehensive framework for continuousimprovement and commitment to the highestlevels of customer satisfaction.
Accredited to ISO 9001:2008, ISO 14001:2004
and OHSAS 18001:2007
Kemtron has the knowledge, skills and resourcesto develop individual EMC solutions that matchyour exact requirements. This might take the formof custom-designed products or advice to yourproduct development team on the design ofenclosures and fixings to improve shieldingperformance.
If you are designing new products, we recommendbringing in our technical team at an early stage inthe development process. We can provide advice ondesign requirements that will ensure optimum
shielding when used with the right EMC product.We can also develop solutions for retrofitted EMCproducts to overcome operational problems,improve shielding performance, or meet changingregulatory requirements.
By working closely with many of the world’sleading material producers, we can meet thedemands of customers who want to meet ever-increasing performance criteria or ensure reliableoperation in extreme climatic, environmental oroperational conditions.
EMC Components& Gaskets
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Introduction
With over 30 years’ experience in theenvironmental sealing industry, Kemtron hasthe knowledge, skills and resources to developindividual tailored solutions for new or existingproducts that match your exact requirements.
We can also provide advice on design requirementsthat will ensure optimum protection when usedwith the right gasket or seal. We look at a wide
range of factors including compression forces,chemical resistance and flame resistance that willimpact sealing performance through the life ofyour product and work with you to design asolution that balances performance, reliabilityand cost.
We are able to offer materials that have widetemperature ratings, long operational life, IPsealing, resistance to fluids and NBC chemicals,UL94 listings for fire retardancy and lowtoxicity products.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Electrical
The electrical requirements are covered by measurementsmade to ascertain the level of attenuation requiredto fulfil the figures laid down in the appropriatespecification over a specified frequency band.
The data given in the catalogue outlines the typicalattenuation versus frequency of the various materialswhen correctly fitted. These figures are corroborated by
independent tests.
Mechanical
The mechanical considerations are of the utmostimportance in the fitment of shielded gaskets.
The design of an EMI shielded enclosure should beundertaken as if the gasketing will be required. If it is
determined at a later stage that a particular gasket isnot required it is easy to leave this out. If no provisionfor the gasket is made and then later required themodification to implement a gasket can be time
consuming and costly.
The most effective shielding is provided when acontinuous metal to metal contact is achieved. The metalsurfaces of any enclosure flange are never 100% flat
unless machined to very high tolerances. The function ofthe gasket is to take up any differences which may existbetween the surfaces. The type of gasket material and
thickness is thus selected according to the toleranceswith which the enclosure or panel is fabricated.
To ensure metal to metal contact the design shouldincorporate, wherever possible, a means to preventthe over compression of the gasket and thus ensure
evenness of pressure.
It is very important when fitting conductive gaskets that
all contact surfaces be free from contamination and behighly conductive. The surfaces must therefore be freeof paint, greases etc. and thoroughly cleaned prior to
fitment of the gasket.
Chemical
Two dissimilar metals in the presence of an electrolytee.g., sea water. will act as a battery and create a flow of
electric current. This effect can cause corrosion and couldaffect the resistivity of the gasket material reducing itsefficiency. In order to minimise or prevent galvanic actionit is important to select compatible metals.
Environmental
Often equipment will need to operate in conditionswhere the ingress of moisture would be hazardous tothe correct functioning of the system. To prevent this, an
extra non conductive gasket acting as an environmentalseal can be incorporated into the design ofthe enclosure.
A more practical solution is to use an EMI shieldedgasket which incorporates an environmental seal.
Conductive Elastomers are fully cured silicones or fluorosilicone loaded witha variety of highly conductive particles providing superior EMI/RFI shieldingperformance combined with excellent environmental sealing. The variousconductive fillers are designed to ensure galvanic compatibility whilstproviding low contact resistance between mating surfaces.
Kemtron’s many years of manufacturing experience combined withquality control and compliance testing ensures our Conductive Elastomers
are suitable for the most demanding situations, offering consistency timeafter time.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Application• Industrial controls.
• Instruments.• Military equipment.
• Avionics.
• Medical electronics.• Electronic equipment enclosures.
Availability• Highly conductive EMI/RFI gasket
and environmental seal.• Extrusions.
• Flat gaskets.
• ‘O’ Rings.• Sheet.
• Thickness from 0.5mm.
• Wide temperature range -55˚C + 200˚C.• Fluorosilicone for harsh environments: Fuel oils
and solvents.
• Choice of materials for galvanic compatibility.• Flame retardant to UL94VO.• Low smoke-low toxicity.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Technical Specifications
Material Selection
Kemtron manufacture conductive elastomersusing four standard highly conductive fillers in bothsilicone and fluorosilicone variants, all have slightlydifferent attributes:
Conductive fillers available for Silicone andFluorosilicone
• Nickel Plated Graphite A high quality cost effective commercial material withincreased use in the military markets. Easily extruded
or molded. SNG FR grade to UL94 V0 and meetsthe requirements of BS 6853:1999 Incorporatingamendment No1. Low smoke and low toxicity.
• Silver Plated Aluminium An excellent grade high performance materialwidely used for higher frequency applications in the
commercial and military markets. Lighter in weightthan some other materials.
• Silver Plated Copper This material offers excellent RFI/EMI shieldingperformance across the frequency spectrum, butcomes at a higher price and with increased weight.
• Nickel This product has largely been replaced by NickelGraphite but is still widely used in military andaerospace applications. Fluorosilicone has better
aging properties than the silicone. A good performerat lower frequencies but also heavier than someother materials.
Silicone (VMQ)Silicone rubber is used because the end use requires amaterial that retains its elastomeric properties over a very
wide range of temperatures and does not degrade dueto the presence of oxygen and ozone.
Silicone elastomers do have weaknesses in their
properties and behavior. In comparison with otherelastomers their tensile, tear and abrasion properties aresignificantly poorer, however, they do not decay as the
temperature is increased and above 150˚C they become
on the whole better.
The swelling and chemical resistance of silicones iscomparable to those of chloroprene rubber, they are not
affected by aliphatic oils however they swell in napthenicand are attacked by hot aromatic oils.
Silicones main weakness is to hydrolytic attack and
decomposition especially to steam between 120˚C and140°C, they are also susceptible to attack by acidsand alkalis.
Fluorosilicone (FVMQ)Fluorosilicone is used because it overcomes the formers
chemical resistance and swelling weaknesses whilstretaining on the whole the excellent high temperatureproperties. FVMQ however still suffers from attack by
high temperature steam and hydrolysis by both acidsand alkalis.
Production Capabilities
Kemtron’s extensive manufacturing facilities combinedwith our development team, Quality control andexperienced manufacturing personnel enable us to beone of Europe’s leading manufacturers of electrically
conductive elastomers.
Here at Kemtron we develop, test, compound, mould,extrude and vulcanize conductive elastomers.
This enables us to be flexible in our approach towardscustomer satisfaction.
In addition to our standard range, we can develop and
compound new grades of materials at our facility in theUK to meet customer specific requirements, subject to
economic minimum quantities.
Materials
Material Code Material
SNG Silicone Nickel Graphite
FNG Fluorosilicone Nickel Graphite
SNG-FR Silicone Nickel Graphite Flame Retardant UL94 VO and BS 6853:1999
SSA Silicone Silver Aluminium 60˚ Shore A
FSA Fluorosilicone Silver Aluminium 60˚ Shore A
FSA(70) Fluorosilicone Silver plated Aluminium 70˚ Shore A
SSA (65B) Silicone Silver Aluminium 65˚ Shore A Blue
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Test Results
Listed below are the test results of Kemtron’sElectrically Conductive Silicone Elastomer materials.Some tests are performed in house and others byexternal laboratories all using calibrated equipment,
testing to the standard specified in MIL-DTL-83528 C.Kemtron offer the performance data and methodsof testing to MIL-DTL-83528 C for comparison only.
All of Kemtron’s test certificates and reports areavailable upon request. The results were obtained inlaboratory conditions and should be used as a guide
only. Customer hardware and many other factors arebeyond our control. Therefore customers should performtheir own tests to ensure suitability of the product for
the desired performance.
Test Description Material Performance
Elastomer Binder SNGVMQ
SNG-FRVMQ
SSAVMQ
SSA65BVMQ
SSCVMQ
SNVMQ
FNGFVMQ
FSAFVMQ
FSA70FVMQ
FSCFVMQ
FNFVMQ
Conductive Filler Ni/C Ni/C Ag/Al Ag/Al Ag/Cu Ni Ni/C Ag/Al Ag/Al Ag/Cu Ni
Colour Dark Grey Light Grey Tan Blue Tan Dark Grey Dark Green LightGreen
consistency in conductive elastomer seal manufacture.With this in mind;• We specify, batch control and trace all raw materials.• Control compounding with robust procedures and
batch test every mix with calibrated test equipment to
ensure batch to batch consistency and conformance toour published data sheets.
• Use certified and approved outside test laboratories.
• Batch control and trace all manufacturing includingmaterials, tools, equipment and operators.
The controls are embedded into our accreditedmanagement system that we have held since 1988.All the above is overseen by our QA department and our
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Technical Specifications (Continued)
Properties of elastomers that can be
measured and how they impact onselection of the appropriate material
for gasket/sealing purposes
HardnessHardness is a measure of the degree of indentationwhen an indenter of known geometry is placed on theelastomeric surface under a known constant force for
a fixed time. The different scales used Shore A and IRHDare defined by the form of the indenter, applied loadand time of reading after indenter application. In a
standard elastomer there is reasonable agreementbetween observed hardness and Young’s Modulus (E).In the case of conductive elastomers this relationship isnot so clear cut since the elastomer acts more as a binder
for the filler and the hardness appears to have a rule ofmixtures response.
Tensile strength and elongation at breakTensile strength and elongation at break are obtainedfrom the same standard dumbbell shaped test-piece
punched from a moulded sheet of rubber of knownthickness. By use of tensile test equipment fitted withan extensometer a stress v strain response curve can be
obtained and a judgement of the stresses and strainsthat can be made on the material during service made.
Tear
The tearing properties of a material are obtained usingtensile test equipment and a standard test piece of
known dimensions. Tests are carried out in tensionand the results reported in terms of load required perdistance moved by the tear tip.
Compression set
Compression set (or more correctly permanent set aftercompression to a fixed strain) should not be confusedwith either Creep or Stress Relaxation. The test wasoriginally conceived as a measure of state of cure.
The test basically involves compressing a cylinder ofmaterial to a fixed strain and leaving it for a knowntemperature for a fixed time. The compression is
removed, the cylinder allowed to recover over a fixedtime and the height re-measured. The value recordedbeing the percentage difference according to the
equation below;
Compression set at Constant Strain = to – tr x 100to – ts
Where
to is the original thickness
tr is the thickness after recovery
ts is the deflection applied (thickness of shim)
Hence, the test as originally conceived would be carriedout on test pieces cured for varying times at a fixed
temperature and the correct cure determined from
where the compression set value was found to be aminimum. Although the original purpose of the testhas been superseded by modern rheometers the test
continues to be used. The reason for this being the
belief that the test gives an indication of creep whichcan be seen below is not strictly true. Since the test is
an amalgamation of that used to assess creep andstress relaxation.
Creep also known as cold flowCreep is defined as the change in strain with time whilstthe elastomer is held under a constant stress. This stress
can take the form of compression, tension and/or shear.
In terms of how creep applies to a seal or gasket,this is dependent on whether it is constrained or non-
constrained. In the non-constrained environment thestrain within the elastomer will increase with time until
in theory the stress within the elastomer reaches aminimum. The elastomer seal/gasket will compress andspread out. In the constrained environment the seal/ gasket will conform to the groove allowed and the
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Technical Specifications (Continued)
Stress relaxation
Stress relaxation is defined as the change in stress withtime whilst the elastomer is held under a constant strain.
Consider that you have a seal that during installation iscompressed by 10% of its original thickness. To obtain
this 10% compression requires 100 MPa, and you canconsider that the elastomer is exerting 100 MPa in returnand the seal would be able to retain internal and externalforces of 100 MPa. However, with time and ageing the
stress exerted by the elastomeric seal can decay i.e. itmay only exert 90 MPa yet still be compressed by 10%.
The paragraph above describes the reality of StressRelaxation in compression the other two modes of
tension or shear can also be measured.
Certain schools of thought recommend that stress
relaxation issues can be overcome by increasing theinitial compression the seal / gasket is taken to by 25%in the expectation that stress relaxation will occur and
the operational force will be that required. This approachobviously assumes that the seal/gasket will be able towithstand the extra strain and the seal/gasket behavior
to the extra stress remains the same. Consideration mustalso be given to whether it is retained in a groove or freeto take up a natural form on deflection.
Compression deflectionThis test is carried out using a disc of the gasket/seal
material of a known thickness and diameter towhich is applied a load equivalent to 100 psi andthe deflection measured.
Accelerated ageing testsIn general any of the above tests can be carried outon test samples either aged or cut from test sheetswhich have been exposed to air ageing at an elevated
temperature. Such tests may give an indication ofhow the material will perform in the long term in theservice environment.
Standard Tests Specific to
Conductive Elastomers
Volume resistivityIn this test a sample of the conductive Elastomer whosedimensions are known is put under compression to aknown strain. The difference between the known
applied current is compared to that flowing throughthe Elastomer and the resistivity of the Elastomer.
Volume resistivity after extension/breakThis test is the same as that for volume resistivity exceptthat the sample is punched from the central strip of a
dumbbell that has been stretched to break and thenallowed to recover for thirty minutes.
This test gives an indication of the behavior of thematerial if it is stretched during installation or is re-used
during servicing.
Dynamic volume resistivity
In this test the variation in the volume resistivity ismeasured whilst a sample of known dimensions is putunder a fixed load. The load is then oscillated around
this fixed point by a known amount over a range offrequencies and the volume resistivity recorded.
The purpose of this test is to give an indication as tohow the seal/gasket will perform in service when thevibrations from equipment operations are imposed
upon it.
Conductive Silicone & Fluorosilicone
Elastomers – Product Handling & Storage
Conductive elastomer products are expected to providea service life of many years. However, if the product is tobe stored, certain factors may have a detrimental effect.
Kemtron recommend that the following precautions arecarefully observed to ensure product longevity:
HandlingThese materials should not be subjected to stretching ineither storage or installation otherwise the conductive
particles may disperse in the rubber, resulting indegradation of the shielding performance. In additionmaterials should be handled using cotton gloves to
prevent surface contamination. Extra care must be usedwhen fitting gaskets into channels, especially “O” rings.
The product should be eased into the final groove shapefrom each end or opposite diagonals, working slowlyinwards or round the outside. It must not be placed in atone end and simply pushed in along the length, this will
stretch the gasket and leave excess material. If in doubtplease contact us for our recommendations.
Storage temperatureIt is recommended that the product be stored at normalambient temperatures.
Exposure to light & UVExposure to any UV source (i.e artificial or natural light)should be avoided if possible. It should be kept storedin light proof, sulphur free packaging.
Method of storageThe material must be stored without any stretching
or crushing. It is best kept in light proof, sulphur freepolythene bags or light proof, sulphur free boxes.
Contact with other materialsThe product should not be allowed to comeinto contact with Solvents, oils & greases, PVC,
any material containing sulphur, dissimilar rubbersor metal containers.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Product Overview
Kemtron manufacture a wide variety of profiles from our standard tooling.We are also able to produce to your exact requirement with minimaltooling cost.
Extruded profiles are available in continuous, cut lengths or fabricated toyour requirements, such as rectangles by vulcanizing the joints. This processuses the same conductive polymer compound. Ensuring complete electricalconductivity is maintained across the joints. Please see ‘O’ ring section.
Design Considerations• When selecting a profile it is important to give
attention to the mechanical design of your product.Round and D section seals should ideally be mounted
in a suitably sized channel or groove.• If the gasket is to fit in a groove. It is important that
the gasket size chosen does not overfill the groove,
when using solid sections you should ensure thatthe groove cross sectional area is a minimum of5% greater than the proposed gasket cross section.
See grove design data.• Attention must also be paid to the closing force
required to compress the gasket to the working
height required.• Self adhesive backing usually only partially covers
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Hollow Rectangular
DIm A Dim B ØC Part Number
7.75 8.38 3.18 1208-XXX-0078-0084
9.53 9.53 4.78 1208-XXX-0095-0095
Tolerances
Up to 2.0mm ± 0.1mm2.0mm to 5.0mm ± 0.15mm5.0mm to 9.0mm ± 0.2mm
Materials
Material Code Material
SNG Silicone Nickel Graphite
FNG Fluorosilicone Nickel Graphite
SNG-FR Silicone Nickel Graphite Flame Retardant UL94 VO and BS 6853:1999
SSA Silicone Silver Aluminium 60˚ Shore A
FSA Fluorosilicone Silver Aluminium 60˚ Shore A
FSA(70) Fluorosilicone Silver plated Aluminium 70˚ Shore A
SSA (65B) Silicone Silver Aluminium 65˚ Shore A Blue
SSC Silicone Silver Copper
FSC Fluorosilicone Silver Copper
SN Silicone Nickel
FN Fluorosilicone Nickel
Profile 1208
Technical Specifications (Continued)
How To Order
Select chosen profile and size from our extrusionsection then insert the material code XXX(1201-XXX-0030).
e.g.
1201-SNG-0030 Silicone nickel graphite 3.0mm dia cord
Gaskets in Grooves
For the typical electronic enclosure, groove mounted
gaskets are better than surface mounted gasketsbecause when the gasket is compressed in the groovethe two mating flanges can come into contact with each
other thereby enhancing the EMC performance with theadvantage of the groove acting as a compression stop
and therefore protecting the gasket from damage at thesame time.
Solid and Hollow Gaskets in Grooves
Because solid and tubular style gaskets, when
compressed, cannot change their volume the groovehas to be larger in width to accommodate the changein shape, otherwise severe gasket damage can be
caused when the flanges are fixed together. Thiscan result in loss of compression on the gasket and“compression set” occurring. This will give a reduction
of shielding effectiveness, coupled with the possibilityof environmental leakage. The groove width shouldbe from 5% to 35% larger than the gasket width,
but this is dependent upon the gasket profile being used.For example, a round section gasket has less volumethan a square section gasket of the same diameter/
width.
The important factor is that in the worst case of high
tolerances on the gasket size versus low tolerances onthe groove size is that when the gasket is compressed byboth flanges, it fills the available space by no more than
100%, i.e.: the volume of the accommodating groovewith both flanges touching should be equal to, but beno less than the volume of the gasket cross section.
Knife Edge into Grooves
with Tubular Gaskets
Large applications, such as cabinets, may use a tubular
type gasket fitted into a groove and the mating flangeknown as a knife edge. The knife edge plunges into thegasket causing the seal. With tubular gaskets the knife
edge collapses the gasket rather than compressing it.The knife edge should not penetrate the gasket by morethan 50% of its diameter or there may be a danger of
the gasket being unable to recover due to the excesspressure applied by the knife edge.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Technical Specifications (Continued)
Gasket Groove Sizes
Cord Diameter mm 15% Compression 20% Compression
Depth Width Depth Width
1.00 0.85 1.10 0.80 1.15
1.10 0.94 1.21 0.88 1.27
1.20 1.02 1.32 0.96 1.38
1.30 1.11 1.43 1.04 1.50
1.40 1.19 1.54 1.12 1.61
1.50 1.28 1.65 1.20 1.73
1.60 1.36 1.76 1.28 1.84
1.80 1.53 1.98 1.44 2.07
2.00 1.70 2.20 1.60 2.30
2.20 1.87 2.42 1.76 2.53
2.40 2.04 2.64 1.92 2.76
2.50 2.13 2.75 2.00 2.88
2.60 2.21 2.86 2.08 2.99
2.80 2.38 3.08 2.24 3.22
3.00 2.55 3.30 2.40 3.45
3.20 2.72 3.52 2.56 3.68
3.50 2.98 3.85 2.80 4.03
3.80 3.23 4.18 3.04 4.37
4.00 3.40 4.40 3.20 4.60
4.30 3.66 4.73 3.44 4.95
4.50 3.83 4.95 3.60 5.18
4.80 4.08 5.28 3.84 5.52
5.00 4.25 5.50 4.00 5.75
5.30 4.51 5.83 4.24 6.10
5.50 4.68 6.05 4.40 6.33
5.80 4.93 6.38 4.64 6.67
6.00 5.10 6.60 4.80 6.906.30 5.36 6.93 5.04 7.25
6.50 5.53 7.15 5.20 7.48
The above cross sectional area groove sizes allow for thefree movement of the gasket when being compressed.
This method of calculation ensures that the volume ofthe gasket does not exceed that of the groove whenfully compressed, resulting in groove overfill. This also
minimises the amount of compression force required toachieve a good RFI/EMI seal.
It is important to note that when designing in an EMCgasket, that the principles of O ring design for pressure
sealing do not apply. The groove depth dimension isthe most important, as it is this that limits the gasketcompression. The groove width has no maximumdimension and is only there for gasket location purposes.
Tighter groove dimensions using volume calculationsmay be employed to enhance environmental sealing.However this will increase the compression forces
required.
The above calculations are based on reducing the depthof the groove by a given compression % and increasingthe width by the same amount less 5% EG: 20%reduction in depth 15% increase in width.
When choosing a tube section as a gasket it is
recommended that consideration be given to the lowercompression forces, making sure that there is enoughresilience in the gasket to ensure a good RFI/EMI seal.
In these cases it is sometimes better to use the volumegroove size calculation, with the groove side wallsoffering support for the tube.
Because there are so many variables with tube cross
sections it is difficult to give precise information onthis subject. Kemtron are able to supply samples forevaluation purposes.
Compression % 10 15 20 25
Cord Diameter mm Force per 100mm
1.0 17N 24N 35N 47N
2.0 26N 43N 68N 94N
3.0 37N 66N 110N 154N
4.0 66N 105N 146N 196N
Tolerances
Up to 2.0mm ± 0.1mm
2.0mm to 5.0mm ± 0.15mm
5.0mm to 9.0mm ± 0.2mm
It is also important to consider the tolerances of thegasket and the groove.
Internal Bend Radius
The minimum internal bend radius of a solid cord gasket is 1.5 x cross
section of cord.
The minimum internal bend radius of a tube gasket where the id of the
tube is no greater than 30% of the cross section is 2.5 x cross section
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Product Overview
Kemtron’s experience in the manufacture of ‘O’ rings is vast, our preferredmethod of production is extruded and jointed. We have a huge selection ofvulcanizing tools to suit our standard extrusions.
The jointing process uses the same conductive polymer compound ensuringcomplete electrical conductivity is maintained across the joints.Moulded versions are available if specifically requested.
Both silicone & fluorosilicone with all varieties of conductive fillers are
available for the manufacture of ‘O’ rings.Advantages Of Vulcanised ‘O’ Rings• Cost effective.
• No tooling costs.• Reduced lead times.
• Better surface finish (zero flash).
• Allows hollow sections to be used for lowercompression force.
• Custom lengths easily produced.
• Tight tolerances on developed length andcross section.
• Vulcanised ‘O’ rings with a ID as small as 10mm
depending on cord diameter.
Design Considerations• When selecting a profile it is important to give
attention to the mechanical design of your product.Round and D section seals should ideally be mountedin a suitably sized groove.
• If the gasket is to fit in a groove. It is important thatthe gasket size chosen does not overfill the channel,when using solid sections you should ensure that
the groove cross sectional area is a minimum of 5%greater than the proposed gasket cross section.
• Attention must also be paid to the closing force
required to compress the gasket to the workingheight required.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Technical Specifications
Standard Inside Diameter Of ‘O’ Ring
3.50 X 1.0 0035-00103.80 X 1.0 0038-0010
4.00 X 1.0 0040-0010
2.50 X 1.1 0025-0011
2.60 X 1.1 0026-0011
2.80 X 1.1 0028-0011
3.00 X 1.1 0030-0011
3.20 X 1.1 0032-0011
3.50 X 1.1 0035-0011
3.80 X 1.1 0038-0011
4.00 X 1.1 0040-0011
2.50 X 1.2 0025-0012
2.60 X 1.2 0026-0012
2.80 X 1.2 0028-0012
3.00 X 1.2 0030-0012
3.20 X 1.2 0032-0012
3.50 X 1.2 0035-0012
3.80 X 1.2 0038-0012
4.00 X 1.2 0040-0012
2.50 X 1.3 0025-0013
2.60 X 1.3 0026-0013
2.80 X 1.3 0028-0013
3.00 X 1.3 0030-0013
3.20 X 1.3 0032-0013
3.50 X 1.3 0035-0013
3.80 X 1.3 0038-0013
4.00 X 1.3 0040-0013
3.00 X 1.5 0030-0015
3.20 X 1.5 0032-0015
3.50 X 1.5 0035-0015
3.80 X 1.5 0038-0015
4.00 X 1.5 0040-0015
4.30 X 1.5 0043-0015
4.50 X 1.5 0045-0015
4.80 X 1.5 0048-0015
5.00 X 1.5 0050-0015
3.00 X 1.6 0030-0016
3.20 X 1.6 0032-0016
3.50 X 1.6 0035-0016
3.80 X 1.6 0038-0016
4.00 X 1.6 0040-0016
4.10 X 1.6 0041-0016
4.30 X 1.6 0043-0016
4.50 X 1.6 0045-00164.80 X 1.6 0048-0016
5.00 X 1.6 0050-0016
4.00 X 2.0 0040-0020
4.30 X 2.0 0043-0020
4.50 X 2.0 0045-0020
4.80 X 2.0 0048-0020
5.00 X 2.0 0050-0020
4.00 X 2.2 0040-0022
4.30 X 2.2 0043-0022
4.50 X 2.2 0045-0022
4.80 X 2.2 0048-0022
5.00 X 2.2 0050-0022
4.50 X 2.5 0045-0025
4.80 X 2.5 0048-0025
5.00 X 2.5 0050-0025
4.80 X 2.8 0048-0028
5.00 X 2.8 0050-0028
How to order
Select the material from the list and insert the materialcode followed by the section reference and finally theinside diameter. (1302-XXX-XXXX-XXXX-XXXX)
e.g.
1302-SNG-0030-0015-0500 Silicone Nickel Graphite Hollow cross section3.0mm O/D x 1.5mm I/D ‘O’ Ring 50mminternal.
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Product Overview
Flat gaskets are produced from moulded sheet using economic rule dies.Larger gaskets can be cut from moulded or fabricated picture frames.This option has the advantage of saving material and allows larger gasketsto be produced economically. Fabricated frames use either extruded ormoulded flat section that is joined by vulcanizing the polymer. The sameconductive polymer compound is used to vulcanize the joints ensuringcomplete electrical conductivity is maintained across the joint.
This process has allowed Kemtron to produce gaskets up to 2 meters’ long,with the same mechanical and electrical integrity as is found in a single partgasket cut from sheet. This method of manufacture often offers costsavings over cutting from sheet with subsequent loss of waste material.
Our in-house production facilities are suitable for prototype, short andmedium production runs, up to commercial quantities.
Design Considerations
• It is important that this material is not over-
compressed. If the design of the equipment does notallow for any mechanical method of preventing over-
compression, the gasket should be fitted with built-incompression limiters, either metal stops fitted to thegasket, or metal collars fitted into each fixing hole.
• The material is not suitable in sliding applications.
• Recommended compression: 10% to 20%.• Self adhesive backing (conductive or non-conductive)
is offered as an assembly aid only.
• Fluorosilicone: self-adhesive backing is notrecommended for use with this type of elastomer.
• Minimum material width should not be less than 2mm
or at least the material thickness in any part of thegasket. If this cannot be achieved around fixing holesconsider using a slot. Particular attention is required if
specifying compression collars in holes.
• Consideration must be given to compression forces,
hole centres, size and number of fixings and rigidityof mating flanges.
• Integral compression stops or collars should be
considered to limit over compression if externalcontrols cannot be applied. Recommended minimumsheet thickness for integral limits is 1.5mm.
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Materials
Material Code Material
SNG Silicone Nickel Graphite
FNG Fluorosilicone Nickel Graphite
SNG-FR Silicone Nickel Graphite Flame Retardant UL94 VO and BS 6853:1999
SSA Silicone Silver Aluminium 60˚ Shore A
FSA Fluorosilicone Silver Aluminium 60˚ Shore A
FSA(70) Fluorosilicone Silver plated Aluminium 70˚ Shore A
SSA (65B) Silicone Silver Aluminium 65˚ Shore A Blue
SSC Silicone Silver Copper
FSC Fluorosilicone Silver Copper
SN Silicone Nickel
FN Fluorosilicone Nickel
Standard Sheet Sizes
• 150mm x 150mm (code 1210)• 250mm x 300mm (code 1211)• 300mm x 300mm (code 1212)
Standard Thicknesses
• 0.5mm• 0.8mm
• 1.0mm
•
1.2mm• 1.5mm• 1.6mm
• 1.8mm• 2.0mm• 2.5mm
• 3.0mm• 3.2mm
Other thicknesses and sheet sizes are available subject to minimum
quantities.
Self Adhesive Backing
Kemtron have developed a proprietary conductiveadhesive for sheet materials, This adhesive has a shelf lifeof 6 months and is intended for use as an assembly
aid only.
Dimensional Tolerances:
Thickness ± 0.15mm up to 2mm, ± 0.25mm above2mm Linear ±0.8mm,
Hole Centre’s ± 0.4mm
How To Order
Specify the sheet size code followed by the material
code and finally the thickness using 4 numerical digitsto 1 decimal place.
If self adhesive backing is required add SAB after thepart number.
Examples
1210-FNG-0008 = Fluorosilicone Nickel Graphite 150mm x 150mm x 0.8mm
1211-SSA-0015 SAB = Silicone Silver Aluminium self adhesive
backed 250mm x 300mm x 1.5mm
For die cut gaskets please supply a detailed drawing.
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Surface Mounted Gaskets
With surface mounted elastomeric gaskets, the aimshould be to limit the compression of the gasket tobetween 10% and 20%. 10% being the minimumwith a solid silicone style of gasket. (Some form of
compression stop or limit is essential with surfacemounted gaskets to prevent over compression).
Compression stops can be built into many styles of
gasket, or made as an integral part of the flange. Theirheight should equal that of the maximum compressedheight of the gasket. Compression stops fitted into
gaskets can be in the form of collars or washers so thatfixing bolts can pass through them or as solid studslocated either side of a fixing bolt.
The thickness of the gasket for a known application canbe calculated as follows e.g. Consider a gasket whichcan be compressed between 10% and 25% to be usedon flanges which are not perfectly flat, i.e. the flanges
without gaskets touch at some points and leave gapsin others. Since the gasket will compress between10% and 25% we will require 25% compression at the
high points and 10% at the low points (the “gaps”).The greatest gap is therefore 15% of the gasketthickness. If that gap is 0.45mm, then a gasket of
3.0mm thickness is required
This is fine in theory provided that the flanges do
not “bow” when placed under load. To overcomeflange distortion, fixings may need to be added,the number of which will be determined by the flangestiffness/rigidity.
Compression 3
Technical Specifications (Continued)
Compression Limit Applications
Limit Collars
Limit Stops Min
Dia 3mm
10mm10mm
NoticeInformation supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Kemtron Form-in-Place (FIP) Elastomer compounds are directly dispensedonto component hardware or enclosure via a pressurised fluid dispensingsystem on a numerically controlled XYZ table to form a gasket for RFI/EMIshielding and/or environmental seal for dust and moisture. The dispensingmachine deposits the gasket by following a pre-determined CNC path toprovide accuracy and repeatability.
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The process advantages are• Component is integrated with EMI shielding
and/ or environmental gasket.• Materials are one-component room curable.• Assembly time is reduced as gasket is
included on component.• Rapid prototyping.• Low setup costs.• Smaller gasket land required.• Variety of materials available to optimise
shielding and galvanic compatibility.• No material waste.• Excellent EMI shielding.
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Applications
Suited to applications where small, intricate gasketproles are required, such as on multi-compartmentlabyrinth housings with minimum gasket land area
where traditional larger types of gasket are not suitable.This process also negates the assembly costs associatedwith traditional gaskets as the Form-in-Place gasket
becomes an integral part of the housing or enclosure.The process is suitable for depositing on both metaland metallised plastic components/housing.
AvailabilityKemtron can dispense FIP gaskets directly onto the
customer’s free issue hardware or can procure thecomponent hardware thereby reducing the customer’s
supply base. Kemtron can also supply FIP compounds insyringes or Semco cartridges for the customer’s own use.
Form- in-Place gasket materials include:
For RFI/EMI Shielding• Silver plated copper lled silicone.
• To achieve optimum EMI shielding performancethe component surface on which the gasket is tobe deposited must be highly conductive as lowcontact resistance is required between the two.
Chromate finishes on aluminium must be conductive.• The gasket height can be specied between 0.4mm
to 2.0mm, gasket width will typically be 1.5x the
gasket height. General tolerance is +/-0.1mm.• Recommended gasket compression is between 20%
and 30%. Over-compression can damage the gasket
and as compression stops cannot be incorporatedinto the gasket they should be designed into thecomponent hardware.
• Gasket path for the deposition can be determined
from a sample part, drawings or CAD les.
Production CapabilityTo meet the varying demands of customer requirementsKemtron has developed its own CNC Form-in-Place
dispenser. FIP gasketing work has become a regularfeature of our production work and we are able toprovide a reliable, accurate and quick response to even
high volume orders.
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of tness, patent infringement and
Kembond is a range of electrically conductive adhesives that provide avariety of RFI/EMI shielding and grounding solutions. They consist of adensely loaded adhesive filled with micro sized highly conductive particles.
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dissimilar thermal expansion coefficients i.e. mountingshielded windows EMI shielding with environmentalsealing (IP68 possible).
• ESD control/grounding.• Structural adhesive – can be used to permanently
bond metal assemblies.
• Electrical connection of components avoiding the useof mechanical fixings or solder.
StorageIt is recommended that when not in use that the material
is stored in a cool dark, dry place. If kept properly sealedand in a suitable location then the material will remainusable for up to 3 months, depending on type.
HandlingWhen using this material observe usual standards of
industrial hygiene/practice. Avoid skin/eye contactand work in a well ventilated area. For more detailedinformation please refer to the MSDS (Material Safety
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Availability
Electrically Conductive Silicone Adhesives RTV
• Single component – ready to use.• Room temperature cure.• Neutral cure – does not involve corrosive by-products
on curing.• Safe for use with most common substrates – non
tarnishing / discolouring.
• Excellent resistance to ageing.• Wide service temperature range – remains exible and
conductive at extremes of temperature.
• Stable – low bond (joint) resistance throughtemperature cycling.
Kembond RTV can be supplied in either standardmanual or pneumatic (air dispense) 10ml syringebarrels from which the material may be directly applied.Both formats will accept a variety of dispense tips
(including luer lock types) for accurate, controlledapplication. Larger sizes of 55ml, 170ml & 310mlare available on request.
Electrically Conductive Epoxy Adhesives
• Very high bond strength.• Room temperature cure.• Flexible – degree is variable by adjusting mix ratio.
• Extremely resistant to fracture.
• Safe for use with most common substrates –non tarnishing / discolouring.
• Excellent resistance to ageing.• Wide service temperature range – retains strength
and conductivity at extremes of temperature.
• Stable – low bond (joint) resistance throughtemperature cycling.
• Kembond Epoxy can be supplied in either 4ml or 10ml
double syringe packs. The material is automaticallydispensed in the correct 50:50 ratio. Alternatively, thismaterial can be supplied in separate syringe barrels
where variable mix ratios are to be used.
Design considerations
• Service conditions.• Compatibility with substrate.• Galvanic compatibility.
• Rigid or exible bond.
Instructions for UseSurfaces should be clean dry and sound i.e. free from
loose material. It is recommended that areas to bebonded are cleaned using a suitable solvent prior toapplying the sealant.
To ensure the highest level of electrical or shieldingperformance it is essential that the surfaces to bebonded have a low contact resistance. This means that
materials that have a naturally occurring oxide layersuch as aluminium alloys may need to be lightly abradedand cleaned directly prior to bonding.
The adhesive mix ratio for epoxy may be varied in order
to modify the cured properties. For most applicationswe would recommend a 50:50 mix ratio that willresult in a cured adhesive with a small degree ofexibility, high strength and reasonably good low
temperature performance.
Increasing the proportion of hardener up to arounda maximum of 125:50 will result in a cured adhesive
with a relatively high degree of exibility along withimproved low temperature performance but otherphysical properties will be reduced.
Ensure the two components are thoroughly mixed.Once mixed this material has a working (or pot) life ofapproximately one hour (depending on the ambient
temperature) and may be transferred to a syringe forprecise application if required.
Assemble parts as soon as possible and certainly within15-30 minutes of adhesive application.
In most cases parts may be handled after 12 hours butavoid stressing the joint until full cure has been achieved.
Cure rate may be controlled by means of temperature.The adhesive will fully cure within 3 hours at 60°C.
If curing at elevated temperatures be careful to avoidexcessive adhesive outow due to the uncured adhesiveviscosity reducing during the curing process.
Excess material should be removed by means of a spatulaor similar implement. Smaller traces of the uncuredmaterial may be removed by wiping with a lint free cloth
damped with methylated spirit, isopropyl alcohol or MEKtaking care to observe the safety precautions required inusing ammable/harmful solvents of this type.
A priming agent is available for treating someinconsistent or difficult to bond surfaces. Please contactus for further information.
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
A flat, sheet material, comprising a solid or sponge silicone rubber,embedded with Monel or Aluminium metal wires orientated perpendicularto its surface. Excellent RFI/EMI/EMP shielding performance is achieved asthe material has a wire density of 140 wires/cm2 in solid silicone and100 wires/cm2 in sponge silicone providing an environmental and RFI/EMIseal when clamped between two metallic surfaces.
The wires are crimped to aid compression and are chemically bonded
to ensure their retention in the silicone. They will also penetrate most oxidelayers, ensuring a low contact resistance path when suitably compressed.This material also demonstrates EMP survivability.
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Application• A good solution for achieving RFI/EMI/EMP and
Environmental sealing in a single gasket.• Ideal for use as access panels, seals, connector
gaskets etc.
• Good conformity to allow for uneven surfaces.
AvailabilityKemtron is able to offer a wide variety of options as
the material is cut in-house from large blocks, up to228mm wide, using our high-speed slicer, enabling
us to offer all thicknesses (subject to material type)to suit the customer’s exact design requirement.
• Die- cut gaskets.• Large fabricated gaskets.
• Virtually any at shape can be produced.• Sheet material.• Strip material available in continuous lengths.
• Self-adhesive backing to allow for easy assembly.• Can be tted with compression limit stops or collars.
• Small gaskets can be punched in one operation,keeping production costs to a minimum.
• Larger gaskets can be produced cost effectively andwithout the constraint of sheet size limitation fromstrips of material fabricated into the required nished
shape, thus avoiding waste material from the centreof the gasket.
• A uorosilicone version is available for use in
environments where fuels / oils / hydraulic fluids
and other contaminants are present.• Solid Silicone, for use in applications where
higher compression forces allow for betterenvironmental sealing.
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Design Considerations
• It is important that this material is not over-compressed. If the design of the equipment doesnot allow for any mechanical method of preventingover-compression, the gasket should be tted withbuilt-in compression limiters, either metal stops
tted to the gasket, or metal collars tted intoeach xing hole.
• There is no need for a conductive connection where
strips are joined as the wires forming the EMC contactrun vertically though the material; a waterproof sealis achieved by vulcanising the join with silicone.
• The material is not suitable for frequent openingor sliding applications.
• Recommended compression: Solid – 15% to 20%,
Sponge – 15% to 25%.• Fluorosilicone: self-adhesive backing is not
recommended for use with this type of elastomer.
• Minimum material width should not be less than2mm or at least the material thickness in any part ofthe gasket. If this cannot be achieved around xing
holes consider using a slot. Particular attention isrequired if specifying compression collars in holes.
• Particular consideration must be given to compression
forces (see data in this section) hole centres, size andnumber of xings and rigidity of mating anges.
Production CapabilitiesKemtron holds large stocks of raw material blocks,
which are cut in-house on one of the most advancedslicing machines in Europe, and which enables us toproduce bespoke gaskets economically and on time.
We are able to cut sheets up to 228mm wide by 900mmlong, whilst holding a parallel tolerance of +/-0.2mmand can apply self-adhesive backing prior to die cutting
and or fabrication.
Gasket fabrication is a routine feature of our work,
enabling us to produce economic gaskets by maximisingmaterial usage, without the limitations of sheet width.Joins are vulcanised using a silicone compound and over-
compression stops or collars can be tted to the gasketif required.
Our in-house production facilities are suitable for
prototype, short and medium production runs, up tocommercial quantities.
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of tness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of tness, patent infringement and
A composite of metal wire mesh impregnated with an elastomer, creating ahighly conductive and resilient gasketing material for EMI/RFI shieldingand environmental sealing applications.
impregnated with an elastomer filler – Silicone, fluorosilicone or synthetic rubber or;• Expanded Monel sheet without elastomer fller.
The conductive metallic surfaces of the material provide an excellent low resistance contact
whilst under the correctly designed conditions the rubber component ensures effective dustand moisture sealing.
The exposed metallic points on the woven product, where the weave of the wire overlaps,create approximately 80 contacts per cm2 whilst the raised edge on the expanded sheet productcreates approximately 20 contacts per cm2.
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ApplicationsProvides an economic approach to gasketing flat surfaceswhere unevenness does not exceed 0.10mm and/orwhere material thickness constraints occur.
Particularly suited to small thin gaskets such as MIL type
connectors etc. Other thin gaskets can be made in-house
using specialist cutting methods and the material canalso be supplied as continuous sheet for customer’s own
production purposes.
Fluorosilicone versions are suitable for applicationswhere fuels/oils/hydraulic fluids and other contaminants
are present.
AvailabilityCan be supplied as
• Continuous roll, 305mm wide, in 0.5mm and 0.8mmthickness (see specification).
• Standard connectors.
• Bespoke gaskets made to customer’s specifcation.
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Design Considerations
• These materials are not suitable for joining orfabricating. Gaskets are only available as a single part.• Gasket size is limited to 300mm in width with
minimal constraints on length.• Minimum material width should not be less than
2.5mm in any part of the gasket. If this cannot be
achieved around fixing holes, consider using a slot.• As these materials are of a solid nature they
give very little compression and should therefore
be used between ridged flat surfaces with acombined flatness tolerance of 0.1mm maximum.Compression limiting stops are therefore not
normally required with these materials.• Self-adhesive backing is not recommended.
Production Capability
Kemtron holds large stocks of raw materials which,together with our in-house facilities using precisionlaser cut rule dies, enables us to produce bespoke
gaskets economically and on time, whether forprototype, short and medium production runs orfor commercial quantities.
Minimum Land
2.5mm Land area (Or thickness
of material if over 2mm)
Horse Shoe Slot
Insufficient Land
Horseshoe slot
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
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Knitted Wire Mesh
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Overview
A range of knitted wire mesh gaskets, providing a cost-effective solution tohigh shielding performance applications in the magnetic and electrical fieldsRFI/EMI and including EMP.
Manufactured on a circular wire knitting machine using a single wire.The mono-filament interlocking-loop construction gives strength whileallowing it to conform to almost any size or shape. The manufacturingprocess allows for an optional elastomer core to be included in to the
product to aid compression. An additional environmental seal/carrieris also an option. It is available in a variety of combinations to suit manyEMC and environmental sealing applications.
2. Elastomer cored knitted wire mesh.3. Knitted wire mesh with an additionalenvironmental seal.
Production CapabilitiesKemtron has developed its knitted wire mesh productionfacility and expertise in this area to enable it to produce
RFI/EMI gaskets in a wide range of materials and in manydifferent size configurations. Together with our extensivefabrication capabilities and large stocks of raw materials,
we can manufacture knitted wire mesh gaskets to suitmany applications.
We offer a bespoke service, which can also produce
economical gaskets, with good delivery times,in prototype quantities or for short, medium or largecommercial production runs.
Summary Solid Knitted Elastomer Cored Knitted Wire Mesh with an Wire Mesh Knitted Wire Mesh Additional Environmental seal
RFI/EMI/EMC shield • • •
EMP survivability • • •
Environmental seal Dust only Dust only •
Frequent opening • •
Continuous lengths • • •
Cut to length • • •
Fabricated gasket • • •Mesh over elastomer core • •
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ApplicationSolid knitted mesh gaskets provide an excellent
EMI/RFI/EMP gasket shield between two metallic surfacesand with the choice of wire mesh material availableallows for a good galvanic match with mating flanges,
thereby limiting the possibility of corrosion betweengasket and flange.
• RFI/EMI/EMP applications.• Panel seals in screened rooms.
• Areas with infrequent access.• Cable Shielding (Wrapping with at bandage).
Availability• In continuous lengths, cut to length or fabricated
into finished gaskets by spot welding and stitching
to suit customer requirements.• Variety of proles and sizes available.• Fabricated gaskets.
• Compressed mesh rings.• Self adhesive backing is not recommended with
this version of mesh.
Design Considerations
• Consideration should be given to the termination ofcut mesh ends. Sometimes loose wires are evidentafter cutting. Kemtron are experts at mesh termination
however if you choose to cut the mesh yourself loosewires can be avoided by:– Dipping the end in glue,
– Spot welding the cut end.
– Sewing the cut mesh end.• Compression forces required to achieve good contact.
Also the rigidity of the host metalwork.• Galvanic compatibility. Select from a choice of wire.• Water and moisture sealing is not possible with this
product. However it does offer a limited dust seal.
• Solid knitted wire mesh suffers from compressionset. So it is not recommended for frequent openingof panels.
Knitted Wire MeshSolid Knitted Wire Mesh
Product Overview
The product consists of a knitted wire that is formed into an all wireprofile forming a continuous gasket strip.
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Typical Shielding Performance
H Field
MHz 0.01 0.1 1.0 10.0
Monel 28 45 64 >104
TCS 47 67 88 >104
S/St 35 43 50
Aluminium 36 47 64 >104
E Field
MHz 0.1 1.0 10 100
Monel >118 >136 >123 99
TCS >118 >136 >126 109
S/St 119 102
Aluminium >118 >136 >120 91
P Field
MHz 400 1000 10,000
Monel 96 84 46
TCS 98 77 43
S/St 85 62 36
Aluminium 86 72 34
Materials
Monel Alloy 400 Wire (Mon)Wire diameter 0.11mm.
UK Specification to BS3075 NA13USA Specification to AMS 4730
Tin Plated Copper Clad Steel (TCS)Wire diameter 0.11mm
UK Specification BS2316*, BS4087*USA Specification ASTM B277*, ASTM B452*, ASTMB520, ASTM B33*, AISI 1010* There is no complete specification for this material. Processes have
been derived from parts of the above where applicable.
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Product Overview
This product is a knitted wire mesh over an elastomer core such asneoprene or silicone cellular profile or tube. Usually this consists of 2 layersof knitting over the elastomer core but small sections 1.5mm diameterrequiring only 1 layer. The knitted mesh is then formed into the selectedprofile making a continuous gasket strip which is flexible and compressibleand which makes an excellent RFI/EMI/EMP gasket.
Application
In addition to making an excellent EMI/RFI/EMP shield
between two metallic surfaces the choice of wire meshmaterial available also allows for a good galvanic match
with mating flanges, thereby limiting the possibilityof corrosion between gasket and flange. Further, theelastomer core of the gasket allows it to be compressed
using low to medium force conforming to unevensurfaces and recovering well after use.
• Groove gaskets such as ‘O’ rings.
• Due to its resiliency and low compression force,ideal for use in situations where repeated openingand closing operations are necessary.
Availability
• In continuous lengths.• Cut to length.• Fabricated into nished gaskets.• Variety of proles and sizes.
• Fabricated gaskets.• Selection of wire to meet galvanic
compatibility requirements.
• Large selection of elastomer cores are availableto meet conditions such as temperature range,compression set, compression force.
• Although round or rectangular cross sections are
the most commonly used, other sectionscan be made to custom designs.
• Where EMP protection is needed, a minimum of
7 layers is recommended. Additional layers canalso be added depending on the application ofthe equipment and degree of shielding required.
• Self adhesive backing is not recommended withthis version of mesh.
Design Considerations
• Consideration should be given to the termination of
cut mesh ends. Sometimes loose wires are evidentafter cutting. Kemtron are experts at mesh termination
however if you choose to cut the mesh yourself loosewires can be avoided by:– Dipping the end in glue,
– Spot welding the cut end. – Sewing the cut mesh end.
• Compression forces required to allow good contact.
Also the rigidity of the host metalwork.• Galvanic compatibility. Select from a choice or wire.• Water and moisture sealing is not possible with this
product. However, it does offer a limited dust seal.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationThis type of gasket is very suitable where a high level
of shielding is required along with an environmentalseal. Provides an economic approach to combinationRFI/EMI/EMP and environmental sealing.
• Suitable for gaps with large tolerances.• Door seals.• Panel seals.
• Due to its resiliency and low compression force,ideal for use in situations where repeated openingand closing operations are necessary.
Availability• Continuous lengths up to 10 mtrs long.
• Fabricated gaskets to customer’s drawings.• Can be tted with compression limit stops
or collars.
• Easily assembled using the optional selfadhesive backing.
• A broad range of sizes available.• A large range of materials to suit many
RFI/EMI/EMP and climatic conditions including NBC.• Large fabricated gaskets can be
produced economically.
• UL ame retardant approved materials arealso available.
Design Considerations• It is important that this material is not
over-compressed. If the design of the equipmentdoes not allow for any mechanical method ofpreventing over-compression, the gasket should be
fitted with built-in compression limiters, either metalstops fitted to the gasket, or metal collars fittedinto each fixing hole.
• When specifying die cut gaskets minimum materialwidth should not be less than 2mm or at least thematerial thickness in any part of the gasket. If this
cannot be achieved around fixing holes consider usinga slot. Particular attention is required if specifyingcompression collars in holes.
• Particular consideration must be given to compressionforces hole centres, size and number of fixings andrigidity of mating flanges.
• Consideration should be given to the termination ofcut mesh ends. Sometimes loose wires are evidentafter cutting. Kemtron are experts at mesh termination
however if you choose to cut the mesh yourself loosewires can be avoided by:– Dipping the end in glue.
– Spot welding the cut end. – Sewing the cut mesh end.
• Galvanic compatibility. Select from a choice or wire.
Product Overview
Manufactured from either solid knitted wire mesh or knitted wire meshover an elastomer core bonded to an elastomer environmental seal.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Surface Mounted Gaskets
With surface mounted elastomeric gaskets, the aimshould be to limit the compression of the gasket tobetween 10% and 20%. 10% being the minimumwith a solid silicone style of gasket. (Some form of
compression stop or limit is essential with surfacemounted gaskets to prevent over compression).
Compression stops can be built into many styles of
gasket, or made as an integral part of the flange. Theirheight should equal that of the maximum compressedheight of the gasket. Compression stops fitted into
gaskets can be in the form of collars or washers so thatfixing bolts can pass through them or as solid studslocated either side of a fixing bolt.
The thickness of the gasket for a known application canbe calculated as follows e.g. Consider a gasket whichcan be compressed between 10% and 25% to be usedon flanges which are not perfectly flat, i.e. the flanges
without gaskets touch at some points and leave gapsin others. Since the gasket will compress between10% and 25% we will require 25% compression at the
high points and 10% at the low points (the “gaps”).The greatest gap is therefore 15% of the gasketthickness. If that gap is 0.45mm, then a gasket of
3.0mm thickness is required
This is fine in theory provided that the flanges do
not “bow” when placed under load. To overcomeflange distortion, fixings may need to be added,the number of which will be determined by theflange stiffness/rigidity.
This product is manufactured from a synthetic polyester or nylon yarn whichis plated to give electrical conductivity over the surface of the fibre and thenwoven in a traditional way so as to produce a conductive cloth. The cloth isthen slit and wrapped over a soft polyether polyurethane foam core in arange of profiles and results in an economically priced conformableconductive gasket strip suitable for many applications.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationsThe versatility of Conductive Fabric Over Foam and
the huge variety of profiles available makes theproduct suitable for a wide range of applications wherefull EMC screening is required between component
parts especially in high cycling and wiping applicationsand where low compression and excellent abrasionresistance are considerations. Typical applications include
Proles are available in 2100mm lengths with someobtainable in continuous length. Depending on theprofile the product can be
• Cut to length.• Die cut to form fabricated gaskets.• Notched for 90 degree fabrication.
• Mitred.• Supplied with clip on and edge mounting or
with self-adhesive backing.
• Have re resistant properties to UL94VO.• Compression between 10% and 70%.
Design Considerations
• Whilst a limited dust seal can be achieved, additionalenvironmental sealing, if needed, is required.
• Consideration must be given to compressionforces and corrosion compatibility.
• Consider the minimum land area on die cut parts,we would suggest that it is equal to the thickness
of the material.
Production CapabilityKemtron holds large stocks of Conductive Fabric
Over Foam profiles, which can be supplied to customersoff the shelf or die or kiss cut or fabricated to theirrequirements. Gasket fabrication is a routine feature
of our work enabling us to produce economic gasketsby maximising material usage, using a range of in-housecutting and stamping equipment, which is suitable for
prototype, short and medium production runs, up tocommercial quantities.
NoticeInformation supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or order
acknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Beryllium copper (BeCu) spring finger and contact gaskets aremanufactured by punching or etching thin BeCu strip which is pressedand formed into the required final shape and then heat treated to giveit ‘memory’.
Due to their high conductivity, BeCu gaskets provide good EMI/RFI shielding together with lowclosure force properties and are available in a number of plated finishes and mounting styles.In certain closing applications the ‘wiping’ action enhances shielding performance.
The end product results in a low resistance contact finger with excellent anti-corrosion
properties that remains flexible within acceptable limits for many years.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Application
BeCu fingers are suited for use in high cycling RFI/EMIand EMP applications where frequent access is requiredas their construction makes them resistant to fatigue and
only low compression forces are needed. They are suitedto high and low temperature applications and theirwiping action makes them ideal for use in:
• Cabinet doors.• Access panels.• Personnel doors in screened rooms and containers.
• Shielded rooms.
• Grounding contacts.
Availability
There are short lead times on most gaskets,which are available in a large range of standard profiles
in strips, generally 406mm (16”) long. Longer lengthsare available with some in continuous lengths.
Gaskets can be applied using adhesive tape, or canbe slot mounted, clipped on or soldered and in addition
to the standard finish can also be supplied in Tin,Nickel and Silver finishes.
Design Considerations
This product does not provide an environmental seal.Over-compression can result in damaged fingers andloss of effectiveness.
Ensure galvanic compatibility with mounting surfaces.Fixing method must be appropriate to the applicationExposed gaskets are susceptible to damage, catching on
clothing etc.
Production Capability
BeCu gaskets are usually supplied in 406mm (16”)lengths, but can be cut to requirements and, dependingon the profile, are available in continuous longer lengths.
To ensure galvanic compatibility gaskets can be supplied
in a range of finishes including tin, nickel, zinc/clear
chromate, gold, silver and nickel.
Mounting styles include clip-on, stick-on, snap-on,
low profile and hook-ondium or large commercialproduction runs.
NoticeInformation supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to theextent expressly stated on Kemtron’s invoice, quotation or order
acknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of tness, patent infringement and
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Ordering Information
Part No i.e. 1100-105-(yy plated finish)
Other finishes available are
Finish Ref
Solderable unplated 01
Clean and Bright (unsolderable) 02
Gold 03
Silver 04
Bright Tin 17
Bright Nickel 20
Zinc/Clear Chromate 15
Electroless Nickel 18
Finger Strips are supplied with a clean and bright finish as standard.
Handling ConsiderationsBeCu gaskets are fully RoHS compliant.
There are no special toxic hazards associated with thehandling of copper beryllium alloys. However cuts and
abrasions should be treated by normal first aid methodsand it is advised that after contact with copper-berylliumalloys the hands should be washed before food is eaten.
Care should also be taken, as with other metal alloys,to remove all metal particles from the wound whilstnormal hygiene standards should be observed.
Further information can be found in The Health
and Safety Executive (UK) – Guidance Note EH13‘Beryllium – health and safety precautions’.
Beryllium copper alloy 25 (CA172) is used in theseapplications for maximum spring properties ofstrengthand fatigue resistance.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Slot Mounting Clips
Designed to be used in parallel slots in sheet metalwork,suitable for both shielding and grounding and can beused in both compression and wiping action.
Typical ApplicationsFront Panels, Plug in Units, Subrack Assemblies.
Recommendedslot dimensions
Dim A Dim B Dim C Dim D Dim E Dim F Part Number Dim L Dim M Dim N
Above parts are available in Extra Soft form, add ES to prex
i.e.1100ES-952
E F
D Thickness
CA
B
Profile
D
E
B
AC
Push Rivet
38,1
M N
38,1CLSlot
Profile
Rivet Mounted Gasket Strips
This gasket has a continuous central strip on top of thegasket enabling it to be used in a longitudinal slidingaction as well as wiping. A retention clip can besupplied to hold the gasket in placewhen used with t
he sliding action.
Dim A Dim B Dim C Dim D Dim E Length Part Number Dim M Dim N No.Rivets
Designed for applications where a continuous irregularpath must be followed, able to conform to tightradius comers. Can be clipped into a groove or surfacemounted by soldering or conductive adhesive.
A B C D E F Length mm Part Number
6.6 5.8 0.08 3.6 3.05 6.35 610 1100-921-YY
5.1 4.3 0.08 2.8 2.29 4.8 610 1100-941-YY
Ordering Information
Part No i.e.
1100-921-(YY plated finish)
Above parts are available in Extra Soft form,
add ES to prefix i.e. 1100ES-921
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Beryllium Copper Finger Stock
Technical Specifications (Continued)
Profile
B
A
D
C
1,19
4,78
Flat Bank
F
E Recommended Groove Size
Contact Strips
A large range of standard contact strips, which canbe used for grounding or shielding. Strips can also beformed into rings.
Kemtron manufacture a range of gaskets to suit many standard sizeconnectors which require an EMI/RFI gasket with optional environmentalseal. The choice of material is vast and connector gaskets are availablefrom virtually all of the flat sheet EMI materials manufactured by Kemtron.Listed below are a range of gaskets available from our own tools, also a listof the more common materials and thicknesses. If those listed below do notmeet with your exact requirements, we would be pleased to manufacturegaskets to your own design using inexpensive tooling.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Aluminium Honeycomb Air Ventilation Panels consist of an aluminiumhoneycomb foil held in a rigid extruded aluminium mounting frame.The foil, formed and laminated into a series of honeycomb cells that areglued and perforated or laser welded at the join, ensures a conductivepath at each join. Although the foil is conductive in all directions,to enhance EMI performance, two pieces of honeycomb polarised at90º to each other are recommended.
The frame can be supplied with an integral or separate EMI/RFI gasket,and can be treated with a variety of finishes to provide corrosion protectionor improve conductivity.
How do Honeycomb vents work:The principle is that of “Waveguide beyond cutoff. The honeycomb vent is series of tubes thatacts as a waveguide, guiding electromagnetic waves into or out of the enclosure, but as thetubes are long enough then it attenuates those waves. Typically the tube should be at least3 times as long as the diameter. Good practice is 4 times. Therefore a 3.18mm cell shouldbe 12.7mm long.Honeycomb material is used because it offers high shielding performance,light weight and good airflow.
A standard range of Honeycomb vents are available, drawings and part numbers are shown atthe end of this data sheet.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Applications
Ventilation panels are designed for use in electronicenclosures where good air flow is required for coolingand ventilation but where EMC compliance must be
ensured. Typical applications are:
• Electronic Enclosures.• Air Conditioning Units.
• Fan housings.• EMC Racks.• Communication shelters.
AvailabilityAn extensive range of aluminium extrusion mounting
frames are available from stock offering a choice of
mounting methods and sizes.Available as custom sizes with no additional cost.
Frames can be supplied with fixing holes or captive
threaded inserts to aid mounting.
Honeycomb can be supplied in a number ofconfigurations to suit different EMI/RFI Shielding
performance requirements. Such as straight through,polarized and a choice of cell size.
Standard perforated honeycomb is available with 30˚,45˚, 60˚ and 90˚ angles from stock and Laser welded
aluminium honeycomb is also available to special order.
For vulnerable situations weld mesh or expandedaluminium kick plates can be fitted.
Removable dust filters and integral insect screens canalso be provided.
A range of low cost standard fan vents are available tomeet commercial applications where lower performance
is acceptable, consisting of one layer of aluminiumhoneycomb held in a plastic frame.
Design Considerations
Any environmental conditions such as moisture anddust control including:
• Air Flow requirement.• External louvers for rain protection.
• Drain holes.• Any additional gasketing.
Constructional requirements and finishes including:• Angled honeycomb for rain protection or directional
air flow.
• Rigidity of vent frame and enclosure so as toprevent bowing of either surface when compressingthe gasket.
• Fixing requirements e.g. holes or threaded insertsensuring appropriate position and size of hole-centres.(Holes in the corners of the frame should be avoided.)
• If specifying captive inserts in both sides of the frameoff-set the positions by 10mm minimum.
• Round vents tend to be an expensive option due
to the complexity of manufacturing method.• Fully welded corners.• Type of gasket required.
(see Finishes section)• Weld mesh or expanded aluminium kick plates
• Removable dust lters and integral insect screenscan be provided
Production CapabilitiesKemtron manufacture its range of EMC vent panels
using the latest technology and, with the exception ofpainting and plating, all processes are kept in house,giving us flexibility and total control over quality.
Kemtron has invested heavily in this area making us themarket leaders for price, delivery, quality and availability
Fully programmable CNC machines for the notching &
cutting of the frame extrusions and drilling of exact andrepeatable holes combined with the latest TIG welding
equipment allows Kemtron to offer a fast delivery of itscompetitive range of aluminium vent panels producedto customer designs. This advanced technology alsoeliminates the need for additional tooling and set-up
charges. Kemtron holds a large range of aluminiumextrusions and aluminium honeycomb in stock.
In addition to vent panels, Kemtron manufactures ahuge range of EMI shielding products, including
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Honeycomb specification and availability:
Kemtron uses 5052 grade aluminium foil which is alightweight material offering superior strength andcorrosion resistance over commercial grade aluminium
foils. It meets all the requirements of MIL-C-7438.
Standard straight cell sizes & thicknesses held in stock
• 3.2mm (0.125”) cell x 12.70mm (0. 50”) thick
• 3.2mm (0.125”) cell x 6.35mm (0.25”) thick
• 1.6mm (0.0625”) cell x 6.35mm (0.25”) thick
• 3.2mm (0.125”) cell x 3.2mm (0.125”) thick
Standard slant cell sizes, angles & thicknesses held in stock
• 3.2mm (0.125”) cell x 6.35mm (0.25”) thick x 30˚
• 3.2mm (0.125”) cell x 6.35mm (0.25”) thick x 45˚
• 3.2mm (0.125”) cell x 6.35mm (0.25”) thick x 60˚
Kemtron’s standard honeycomb vent uses 2 layers of1
/ 8” cell X ¼” thick laid at 90°, this is known as cross cell.Cross cell honeycomb improves shielding performance byeliminating any polarizing effects.
Frame styles 1701,1702,1703,1704 and 1707 willaccommodate 2 layers of 3.2 x 6.35mm thickhoneycomb, one layer of 3.2mm cell x 6.35mm thick
and one layer of 3.2mm x 6.35mm thick angledhoneycomb or one layer 12.7mm thick honeycomb
Frame styles 1705 and 1706 will accommodate 1 layer
of 3.2 or 1.6mm cell x 6.35mm thick honeycomb.Also possible to accommodate 2 layers of 3.2mmcell x 3.2mm thick honeycomb
Frame style 1709 main use is for dust filter panels thatcan be fitted over EMC vent panels, but canaccommodate one layer of 3.2 or 1.6mm cell x 6.35mm
thick honeycomb, however this is not recommended.
Frame style 1708 is a dividing/support bar for large vents.
Vents are normally supplied with three notched and onewelded corner to achieve the best trade off between
cost and performance. This combined with an EMCgasket is normally sufficient for all but the mostdemanding EMC specifications. In the event that the
best possible attenuation is required all corners can besupplied fully welded. Please note that styles 1702 &1704 are always supplied fully welded due to the nature
Kemtron’s standard finish (Kempass) for aluminiumvent panels fully meets the RoHS directive and replaces
Alocrom1200 which is a hexavalient chromium process.Kemtron’s in-house process applies a permanganatepassivation which is a chromate free, inorganic and
non toxic coating. The process produces a dense,
uniform coating consisting of aluminium and reducedmanganese oxides giving a light yellow colour to the
surface. The surface finish is conductive with a lowcontact resistance equalling Alocrom 1200. It also meetsall requirements of MIL-C-5541E for corrosion and
electrical conductivity. We are also able to offer acomprehensive range of painted finishes to complementour standard Kempass finish. Using industry leading wet
paint solutions from Trimite, we offer full painting andpreparation to DEF STAN specifications including mattand gloss finishes.
In addition we can also offer Infra Red Reflecting (IRR)
matt finishes complying with DEF STAN 00-23, 80-166
and STANAG 2338.For less critical / commercial applications requiring a
protected finish we recommend polyester powdercoating. This is tough material that offers excellentresistance to fresh and saltwater, petrol, linseed and
penetrating oils, along with limited resistance to variousacids. We are happy to advise on specific examplesif required. As the epoxy process is an electrostatic
method, it offers excellent penetration of thehoneycomb cells, further aiding resistance to corrosion.With both processes, we are able to offer a full range
A range of low cost plastic EMC vents for use with80mm, 92mm & 120mm fans. They provide EMCshielding where applications demand a low cost solution,
whilst still providing an adequate shielding performance.A Hi-impact ABS UL94V-0 fire retardant moulding isfitted with one layer of 3.2mm cell x 6.35mm thick
honeycomb and a nickel/copper fabric gasket to groundthe honeycomb to the metalwork. The vents have 4countersunk holes to suit standard fan mountings.
Measured shielding performance in accordancewith Mil Std 285 (80mm size tested)
This consists of a aluminium frame 1701, 1705, 1706,1707 & 1709 which holds a polyester polyurethane dustfilter. This is held in place on one side by a stainless steelweld mesh. This frame then mounts on to one side
of the honeycomb vent panel by captive screws.Easily removed for cleaning with a mild detergentand rinsed with water. A range of different filter
options are available.
Aluminium honeycomb vent panels fitted with removabledust filters usually require assisted air flow.
Standard filter foam is stocked in two thicknesses to suit
the above frame styles.
30, 45 and 60 pores per inch, others are available tomeet specific requirements.
Insect Screen
This is a woven aluminium cloth inserted on one face orbetween the honeycomb and provides protection from
the ingress of insects. Wire dia 0.28mm open area 66%.
Aluminium screen EMC & dust filter ventilation panels consist of multi-layerexpanded aluminium foil mesh trapped in a rigid extruded aluminiummounting frame, the frame can be supplied in a choice of sizes and profiles.Panels can be treated with a variety of finishes to provide corrosionprotection. Air filter oil can be applied to the aluminium filter mediato assist in dirt and dust retention.
Panels with a gasket groove have a knitted monel wire mesh gasket
as standard. Other frames can be provided with an additional EMI Gasket.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationsVentilation panels are designed for use in commercial
electronic enclosures where air flow is required forcooling and ventilation but where EMC complianceand dust filtration must be ensured. Typical commercial
applications are:
• Electronic Enclosures.• Air Conditioning Units.• Fan housings.
• EMC Racks.
AvailabilityA selection of aluminium, extruded profiles areavailable from stock offering a variety of fixing andGasketing options.
Custom sizes manufactured at no additional cost.Frames can be supplied with fixing holes toaid mounting.
Aluminium screen EMC and dust filter ventilation panels
can be supplied with a Kempass (RoHS ) Aluminiumpassivation process finish.
Design ConsiderationsAny environmental conditions such as moisture and dustcontrol including:
• Air Flow requirement (Generally requires assistedair flow).
• External louvers for rain protection.
• Any additional Gasketing.• Cleaning: Vacuum or blow clean with an airline for
dry panels or easily cleaned in detergent solution
prior to re oiling.
Constructional requirements and finishes including:
• Rigidity of vent frame and enclosure so as toprevent bowing of either surface when compressing
the gasket.• Fixing requirements e.g. holes ensuring appropriate
position and size of hole-centres (Holes in the corners
of the frame should be avoided).• Corrosion, electrical conductivity etc,
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Production Capabilities
Kemtron manufacture its range of EMC vent panelsusing the latest technology and, with the exception ofpainting and electro less plating, all processes are kept in
house, giving us flexibi lity and total control over quality.Kemtron has invested heavily in this area making us themarket leaders for price, delivery, quality and availability.
Fully programmable CNC machines for the notching &cutting of the frame extrusions and drilling of exact andrepeatable holes combined with the latest TIG welding
equipment allows Kemtron to offer a fast delivery of itscompetitive range of aluminium vent panels producedto customer designs. This advanced technology also
eliminates the need for additional tooling and set-up
charges. Kemtron holds a large range of aluminiumextrusions. In addition to vent panels, Kemtron
manufactures a huge range of EMI shielding products,including gaskets to compliment the vent panels.
Finishes
Vent panels can be supplied with a range offinishes including:
• Painted (frame only for dust panels).• Electro less plated Tin or Nickel.
Kemtron’s standard finish (Kempass) for aluminiumvent panels fully meets the RoHS directive and replacesAlocrom1200, which is a hexavalent chromium process.
Kemtron’s in-house process applies a permanganatepassivation which is a chromate free, inorganic and nontoxic coating. The process produces a dense, uniform
coating consisting of aluminium and reduced manganeseoxides giving a light yellow colour to the surface. Thesurface finish is conductive with a low contact resistance
equalling Alocrom 1200. It also meets all requirements ofMIL-C-5541E for corrosion and electrical conductivity.
We are also able to offer a comprehensive range ofpainted finishes to complement our standard Kempass
finish. Using industry leading wet paint solutions fromTrimite, we offer full painting and preparation to DEFSTAN specifications including matt and gloss finishes.
In addition we can also offer Infra Red Reecting (IRR)matt finishes complying with DEF STAN 00-23, 80-166and STANAG 2338.
For less critical / commercial applications requiring aprotected finish we recommend polyester powdercoating. This is tough material that offers excellent
resistance to fresh and saltwater, petrol, linseed andpenetrating oils, along with limited resistance to variousacids. We are happy to advise on specific examples if
required. With both processes, we are able to offer afull range of colours to RAL/BS charts.
Aluminium EMC & dust filter ventilation panel consist of 3 layers ofpleated aluminium woven mesh trapped between an expanded aluminiumkick-plate then held in a rigid extruded aluminium mounting frame, The 3layers of pleated wire mesh are separated by the pleats being of differentheight enabling the vent to have a high dust holding capacity. The ventpanel can be used dry or air filter oil can be applied to the aluminium filtermedia to assist in dirt and dust retention.
The frame can be supplied in a range of sizes and profiles and panels canbe treated with a variety of finishes to provide corrosion protection orimprove conductivity.
Panels can be provided with additional EMI gasketing or environmentalsealing if required.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationsVentilation panels are designed for use in electronic
enclosures where good air flow is required for coolingand ventilation but where EMC compliance anddust filtration must be ensured. Typical commercial
applications are:• Electronic Enclosures.• Air Conditioning Units.• Fan housings.
• EMC Racks.
AvailabilityA large selection of Aluminium, extruded profiles areavailable from stock offering a variety of fixing andgasketing options.
Custom sizes manufactured with no additional cost.Frames can be supplied with fixing holes or captivethreaded inserts to aid mounting.
These ventilation panels can be supplied with a Kempass(RoHS ) Aluminium passivation nish.
Design ConsiderationsAny environmental conditions such as moisture and dustcontrol including
• Air Flow requirement (Generally requiresassisted air flow).
• External louvers for rain protection.• Drain holes.• Any additional gasketing.• Cleaning: Vacuum or blow clean with an airline for dry
panels or easily cleaned in detergent solution prior tore oiling.
Constructional requirements and finishes includingRigidity of vent frame and enclosure so as to preventbowing of either surface when compressing the gasket
Fixing requirements e.g. holes or threaded insertsensuring appropriate position and size of hole-centres.(Holes in the corners of the frame should be avoided.)
If specifying captive inserts in both sides of the frameoff-set the positions by 10mm minimum.
Round vents tend to be an expensive option due tothe complexity of manufacturing method.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Gaskets for vents
• Knitted wire mesh = Frames with a gasket groove.• Orientated wire in silicone.• Knitted Monel wire mesh with a Neoprene sponge
carrier 2.4mm thick.• Beryllium Copper nger stock.Other gasket options are available
Production CapabilitiesKemtron manufacture its range of EMC vent panels
using the latest technology and, with the exception ofpainting and plating, all processes are kept in house,giving us flexibility and total control over quality.
Kemtron has invested heavily in this area making us themarket leaders for price, delivery, quality and availability.
Fully programmable CNC machines for the notching &
cutting of the frame extrusions and drilling of exact andrepeatable holes combined with the latest TIG weldingequipment allows Kemtron to offer a fast delivery of its
competitive range of aluminium woven mesh producedto customer designs. This advanced technology alsoeliminates the need for additional tooling and set-up
charges. Kemtron holds a large range of aluminiumextrusions and aluminium woven mesh in stock. Inaddition to vent panels, Kemtron manufactures a hugerange of EMI shielding products, including conductive
vent panels fully meets the RoHS directive and replacesAlocrom1200, which is a hexavalent chromium process.Kemtron’s in-house process applies a permanganate
passivation which is a chromate free, inorganic and nontoxic coating. The process produces a dense, uniform
coating consisting of aluminium and reduced manganeseoxides giving a light yellow colour to the surface. Thesurface finish is conductive with a low contact resistanceequalling Alocrom 1200. It also meets all requirements of
MIL-C-5541E for corrosionand electrical conductivity.
We are also able to offer a comprehensive range of
painted finishes to complement our standard Kempassfinish. Using industry leading wet paint solutions fromTrimite, we offer full painting and preparation to DEF
STAN specications including matt and gloss nishes.In addition we can also offer Infra Red Reecting (IRR)matt nishes complying with DEF STAN 00-23, 80-166
and STANAG 2338.
For less critical / commercial applications requiring aprotected finish we recommend polyester powdercoating. This is tough material that offers excellent
resistance to fresh and saltwater, petrol, linseed andpenetrating oils, along with limited resistance to variousacids. We are happy to advise on specific examples if
required. With both processes, we are able to offer afull range of colours to RAL/BS charts.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Tolerances
Standard tolerances for overall finished vent dimensionsare +/- 0.8mmStandard tolerances on hole centres are +/- 0.4mmTypical corner radii on frame styles 1701 and 1703
are R3.0mm
Specifications
Aluminium frame 6063-T6
Aluminium filter material wire dia 0.28mm open area 66%
Monel wire gasket BS3075 NA13
Neoprene sponge ASTM D1056 (84) SCE 42
Beryllium copper alloy 25 (CA172)
Silicone rubber ZZ-R-765 Class 2 Grade 40
Aluminium wire 5056
Air Flow Results Graph
EMC Performance (db)
Frequency db
0.01MHz 42
0.1MHz 53
1.0MHz 61
10.0MHz 81
100MHz 60
1,000MHz 52
10,000MHz 43
Frame StylesNoticeInformation supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Steel honeycomb air ventilation panels are designed for highperformance applications, where high attenuation is required particularlyin the H (magnetic) field.
Steel honeycomb air ventilation panels consist of a steel honeycombfoil soldered in to a rigid mounting frame. The steel foil is formed andlaminated into a series of honeycomb cells that are welded at the join, ensuring a conductive path at each join.
The frame can be supplied with an integral or separate EMI/RFI gasket,and can be treated with a variety of finishes to provide corrosion protectionor improve conductivity.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationsVentilation panels are designed for use in electronic
enclosures where good air flow is required for coolingand ventilation but where EMC compliance must beensured. Typical applications are:
• Screened Rooms.• Military Air Conditioning Units.• High performance Communication shelters.
• EMP installations.
Availability
All panels are individually built to your specication,Size, Honeycomb configuration, frame style, fixingmethod and finish.
Frames can be supplied with fixing holes to aid
mounting.
Design ConsiderationsAny environmental conditions such as moisture and
dust control including
• Air Flow requirement.• External louvres for rain protection.• Drain holes.
• Any additional gasketing.
Constructional requirements and finishes including
• Rigidity of vent frame and enclosure.
• Fixing options e.g. holes, Soldering.• Type of gasket if required.• Frame style.
Vent panels are supplied with a standard finish of hot tindipped. However an additional coating is recommendedto help combat corrosion. We can advise on a number
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Production Capabilities
Kemtron manufacture its range of EMC vent panelsusing the latest technology and, with the exception ofpainting and electro less plating, all processes are kept in
house, giving us flexibi lity and total control over quality.Kemtron has invested heavily in this area making us themarket leaders for price, delivery, quality and availability.
In addition to vent panels, Kemtron manufacturesa huge range of EMI shielding products, includingconductive elastomers, oriented wire, knitted wire mesh,
connector gaskets.
Finishes
Vent panels can be supplied with a range of
finishes including:• Painted.• Electro less plated Tin or Nickel.
• Hot tin dipped.
We are also able to offer a comprehensive range ofpainted finishes to complement our standard finish.
Using industry leading wet paint solutions from Trimite,we offer full painting and preparation to DEF STANspecifications including matt and gloss finishes. In
addition we can also offer Infra Red Reflecting (IRR) mattnishes complying with DEF STAN 00-23, 80-166 andSTANAG 2338.
For less critical / commercial applications requiring aprotected finish we recommend polyester powdercoating. This is tough material that offers excellent
resistance to fresh and saltwater, petrol, linseed andpenetrating oils, along with limited resistance to variousacids. We are happy to advise on specific examplesif required. As the epoxy process is an electrostatic
method, it offers excellent penetration of thehoneycomb cells, further aiding resistance to corrosion.With both processes, we are able to offer a full range of
colours to RAL/BS charts.
Tolerances
Standard tolerances for overall finished vent dimensionsare +/- 0.8mm
Standard tolerances on hole centres are +/- 0.4mm
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of tness, patent infringement and
Shielded windows provide a high performance EMI shield whilemaintaining optimum optical transparency.
Screening or shielding of optical windows is achieved by using either:• A very ne woven wire mesh trapped between or embedded in a clear optical
substrate such as acrylic, polycarbonate or glass, or• A transparent vapour deposited conductive coating such as Indium Tin Oxide
or Gold applied to the surface of the clear optical substrate.
Termination of the window to the enclosure is achieved with a continuous low resistance
conductive edge around the window, either a conductive buss bar and conductive gasket,or extended wire mesh (see window mounting)
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationEMI shielded windows provide an EMI screen as
part of a shielded enclosure which will provideprotection against radiated emissions and susceptibility.Shielded windows provide good transparency for
viewing display devices such as LED, LCD, vacuumfluorescent, plasma etc and they can also form thefront panel of an enclosure to provide impact protection,
contrast enhancement of displays, display colourmatching, anti reflection and an anti glare surfaces.Large windows can provide transparent EMI shielding
for architectural use such as computer rooms, shieldedrooms, MRI rooms and secure communication cabins.
AvailabilityEMI shielded windows are made to customerspecication. Sizes can range from 1cm² up to
1x2 metres for architectural use. Windows can besilk screened or printed with logos, information etc.Termination can be by mechanical clamping using
a conductive gasket or by bonding into the enclosurewith a conductive adhesive.
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of tness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conict with existing or future patents
of third parties. All risks of lack of tness, patent infringement and
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Product Overview (Continued)
Design Considerations
Optical Substrates
Acrylic is a versatile substrate available in a range ofcolours to match display outputs to improve contrast
enhancement including clear, which exhibits 92% lighttransmission, through to infra-red transmitting opaquematerials. Acrylic is easily machined and formed making
it suitable for front panels needing cut outs, holes,steps etc. Multiple layers can be fully laminated withne wire meshes together with different colour
combinations and the inclusion of circular polarizers.Acrylic has a UL94HB ammability rating and hard antiscratch, chemical resistant coatings can be applied to
the surface as an optical flat or as anti-glare.Polycarbonate has very high impact resistance, morethan 16 times that of Acrylic and 200 times more thanglass making it most suitable for rugged applications.
Whilst its light transmission is not as good as othersubstrates at 85%, it has the advantage of havingUL94VO ammability rating over 2.4mm thickness.
Hard anti scratch, chemical resistant coatings canbe applied to the surface as an optical flat or asanti-glare. Fine wire meshes can be fully laminated
between two layers.
Glass has a very durable surface and will withstandhigh temperatures making it suitable for the application
of vapour coatings such as ITO (indium tin oxide) forEMI shielding and/or anti reflection coatings that willreduce rst surface reections to less than 0.5%.Glass can be fully laminated with ne wire meshes
and circular polarizers when required.
ADC (Allyl Diglycol Carbonate), trade name CR39,has a very hard surface hence its use as spectacle lenses.
ADC is normally cast and has good impact resistanceand is highly formable but is easily broken if scratchedor notched. ADC meets UL94HB ammability rating
but is the most expensive substrate.
Shielding Media
Fine Wire Meshes provide the highest level ofshielding while maintaining excellent optical properties.
Wires used as the EMI shield are stainless steel orcopper. The stainless steel mesh ranges from 50 wiresper inch up to 250, copper mesh 70, 100 and 145.
Wire diameters are 0.025mm or 0.056mm for stainless,0.056mm for copper. The greater wire density givesbetter shielding performance but light transmission
and optical clarity is degraded. The optimum wirecount to achieve good shielding and opticalcharacteristics is around 80-100 wires per inch.
The wire is plated and blackened to fuse the wirecrossovers ensuring consistent EMC performance andthe blackening reduces specular reflection from themesh, enhancing the optics. Wire meshes can cause
moiré fringing on some displays. To eliminate this thewire is orientated in the substrate at an angle to bedetermined during the window design, this may from
11 to 45 degrees dependant on the display.
Transparent Vapour Deposited Conductive CoatingsITO (indium tin oxide) and Gold can be applied to thesubstrates but do not provide as effective shielding as
the wire meshes. Their advantage is that optical clarityis maintained and there is no degradation in resolution
or fringing that can be caused by ne wire meshes.The coating can be applied in various thicknesses to
EMI cable glands are manufactured in brass and consist of 4 parts.The body, cap, locknut and the mesh olive. The cable entry glanduses a wire mesh olive, which consists of knitted wire mesh over asilicone core which when compressed by the cap being tightened tothe body provides circumferential pressure to both the cable and glandbody, giving excellent electrical conductivity between the two.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Application
The Cable Entry Gland provides an excellent EMP/RFI/EMI
shield for screened cable which pass throughenclosure walls.
AvailabilityManufactured in a range of sizes to accommodate cables
with a diameter over the screen from 2mm up to 16mm
Design Considerations
A round or threaded hole is required to mount the gland.(The gland can also be soldered into the enclosure wall).
Using a heat shrink boot (not supplied) can also providea degree of environmental sealing.
Production CapabilitiesKemtron manufacture these glands as a standard part,however if you require something slightly different
or with a plated finish we are able to accommodaterequests subject to minimum quantities.
Part No. Max Ø over screen Min Ø over screen Dim A Dim B Dim C Hole Ø Thread
UK Specification BS2316*, BS4087*USA Specification ASTM B277*, ASTM B452*,ASTM B520, ASTM B33*, AISI 1010* There is no complete specification for this material. Processes have
been derived from parts of the above where applicable.
Silicone RingZZ-R-765 2b 40 -60ºC TO 200ºC
Profile
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Kemzip is a cable screening product designed to be wrapped aroundcables requiring EMI/EMC protection. It is especially suitable for retrofittingto products already in production that are suffering from RFI radiationor conducted emission susceptibility problems. UV, ozone and weatherresistant, self-extinguishing materials operating over a minimumtemperature range of -30°C to +105°C.
Kemzip is available in many variants, contact us to discuss your specific
application, see below for examples of some of the range.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Electrically conductive foil tape is manufactured by applying a conductiveadhesive to one or both surfaces of a metal foil such as copper oraluminium. This is then either self wound or has a separate release linerapplied. This is then slit to standard or custom widths.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Applications• Temporary sealing of gaps for EMC testing.
AvailabilityNormally supplied in 33 metre rolls, in standard widths
of 13mm & 25mm. However any width from 8mm upto approx 200mm, and 50 metre rolls can be supplied tospecial order. We can also supply with non-conductive
adhesive or without adhesive if required, to special order.
Tapes can be supplied in two versions – Self Wound,without a release liner, or with a paper release liner.
Versions having the paper release liner have a suffix-6 added to the part number.
Example
Copper Tape with conductive adhesive with release liner = 9115-6
without release liner = 9115
• Die cut parts
• Kiss cut parts
Design Considerations• Consider if it is a temporary or permanent solution.
• Galvanic compatibility.• Adhesive strength.
Production Capabilities• Die cutting.• Slitting.
• Laminating.
Material Part No
Aluminium Tape with conductive adhesive for EMI shielding. 9015
Copper Tape with non-conduct ive adhesive . 9110
Copper Tape with conductive adhesive for EMI shielding, solderable. 9115
Copper Tape with conductive adhesive on both sides for EMI shielding. 9116
Tin-clad Copper Tape with non-conductive adhesive, solderable. 9510
Tin-clad Copper Tape with conductive adhesive, solderable. 9515
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Custom designed shielding laminates are manufactured with electricallyconductive metal foil laminated to another substrate often a non-conductive material such as melinex. The conductive media can be insulatedacross the whole surface or selective areas. This can then be made selfadhesive backed.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationA unique range of laminated shields applying selective
die cutting techniques for cost effective solutions toa variety of shielding problems. Available in a widerange of materials and thicknesses.
Shielding laminates are commonly provide aremovable RFI / EMI shield in PCB housings, key board,touch panel shields and for isolating components in
electronic enclosures.
AvailabilityBespoke Laminates can be produced quickly to suitparticular applications and provide a more effectivesolution than a standard product.
Die cutting is a flexible process offering a cost
effective product with quick turn round times.
• Lower cost than conductive coatings.• Effective attenuation.
• Recyclability.• Lower tooling and set up costs.• Insulating capabilities.
• Scratch resistant.• Short lead times.• Easy prototyping.
Design ConsiderationsFactors such as size, volume, accessibility of
components etc will dictate the design suited to aparticular application but careful consideration should
be given when choosing the required material:
Production CapabilitiesKemtron has considerable experience in the design,manufacture of a wide range of shielding productsand is able to help customers find solutions to their
shielding requirements.
SpecificationsAs laminates are custom designed please contactour sales department to discuss your requirements.We will need a drawing or specification giving overall
dimensions, type of material configurations, quantity,tolerances, packaging and any special requirements.
Notice
Information supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or orderacknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patents
of third parties. All risks of lack of fitness, patent infringement and
Custom designed shielding cans are manufactured by photo etching orpressing thin metal sheet, which is then folded and soldered or tabbedto form the shielding can. Cans can have a removable or a fixed integral lidand they are then mounted on a PCB covering single or multiplecomponents to provide excellent EMI/RFI shielding.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
ApplicationPC board screening cans present an effective solution
to the isolation of board level components and canprovide individual or multi-cavity shielding overcomponents on a PCB.
AvailabilityBespoke cans can be produced quickly to suit particular
applications and provide a more effective solution thana standard product.
Photo Etching is a flexible process offering a cost
effective product with quick turn round times.
Cans be supplied flat for self folding with etched foldlines or ready folded.
Stamping and pressing is a more expensive process due
to tooling costs but offers high volume capability with
low unit costs and are only available ready folded
• Cans be produced with solid tops or with removable
fingered lids for component access.• Cans can be supplied to suit through hole or surface
mount assembly.
• Internal dividers can be added to most designs.• Ventilation and access holes can be incorporated
in both lids and fences.
• Smaller cans can be supplied tape and reeled forautomated assembly.
• A wide range of materials and nishes are available,
including non ferrous metals such as phosphor-bronzeand beryllium copper and tin, nickel and tin/lead
plating finishes.
Design ConsiderationsFactors such as size, volume, assembly technique,accessibility of components etc will dictate the
design suited to a particular application but carefulconsideration should be given when choosing therequired material:
• Low frequency applications such as transformers,coils etc should use a high permeability materialsuch as steel or nickel iron.
• High frequency applications such as microprocessors,fast switching devices, switched mode power suppliesshould use non-ferrous materials.
Production CapabilitiesKemtron has considerable experience in the design,
manufacture and testing of a wide range of shieldingproducts and is able to help customers find solutions
to their shielding requirements.
SpecificationsAs cans are custom designed please contact our sales
department to discuss your requirements. We will needa drawing or specification giving overall dimensions,type of material, plating, through hole/surface mount
configurations, quantity, tolerances, packaging and anyspecial requirements.
Kemtron distribute a large range of ferrites for EMI suppression. Ourwarehouse facility has a large range of cable and surface mount productswhich are generally available for same day despatch. Non stocked parts canalso be obtained in a few working days.
Kemtron distributes from world leading producers of ferrite and related materials used in theelectronics, copier, telecomms, military and automotive industries. Nickel zinc ferrite parts areused extensively in the suppression of electromagnetic interference commonly known as EMIFerrite, materials exhibit magnetic properties which are dependent on the frequency at which
they are excited. In electronic applications the relation of the magnetic loss to frequency isutilized to attenuate interference frequencies where the material’s losses are high, yet passthe lower bands where data is carried.
The Kemtron range of EMI ferrite is split into two main areas:
• Cable ferrites, comprising solid and split core versions for use on round and ribbon type cables. Broadband & High Frequency versions are now available for round andcylindrical cores.
• Board Mount Products, comprising chip ferrites, common mode chokes, multi-turn devices etc, many available in both surface mount and through hole board versions.
The ranges are extensive and continually being updated, please visit our web site to view therange or contact our sales office to discuss your requirements.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Kemtron offers a wide range of products designed for all areas ofenvironmental sealing for electronic instruments, cabinets and enclosuresfrom flat gaskets, extrusions, ‘O’ rings and form in place. We are able tooffer materials that have wide temperature ratings, long operational life, IPsealing, resistance to fluids and NBC chemicals, UL94 listings for fireretardancy, low toxicity products etc, many available from stock.
Kemtron can offer precision cutting, slitting, kiss-cutting, extrusions,
mouldings, form in place dispensing direct to surfaces and a comprehensiverange of vulcanized silicone ‘O’ rings. Kemtron has full facilities available toself-adhesive back materials, provide integral compression stops or collarsto prevent gasket damage and fabrication of gaskets, etc.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Kemtron has the capability to produce many designs and styles of flatgaskets. We have a versatile process of manufacture, which is ideally suitedfor development and pre-production through to full production volumes.Modern tooling, enable complex shapes to be produced whilst maintainingtight, repeatable tolerances. Single or multipart tool configurations allowfor efficient, economical production techniques.
Flat gaskets are produced from sheet while larger gaskets can be cut from fabricatedpicture frames.
This option has the advantage of saving material and allows larger gaskets to be producedeconomically. This is facilitated by our in-house tool making and silicone moulding facilities.Fabricated frames use either extruded or moulded flat section that is joined by vulcanizingthe polymer.
This process has allowed Kemtron to produce gaskets up to 2 meters long, with the samemechanical integrity as is found in a single part gasket cut from sheet. This method ofmanufacture often offers cost savings over cutting from sheet with subsequent loss of wastematerial. During this process compression stops or collars can also be incorporated. This leadsto reduced hardware costs and negates the need for fixings to be torqued to prevent overcompression and damage to the gasket.
Our experience in laminating allows us to apply self-adhesive backing tape to even the mostdifficult materials such as silicone, regardless of quantities. We use a range of high performancetapes suitable for all conditions.
Kemtron has in house slitting capability, which allows us to convert sheet or log materials intostrip or coils. This flexible technique with short lead times allows materials to be supplied toexact customer requirements with low minimum order quantities.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
*special minimum order quantity may apply
Environmental SealingFlat Gaskets
Availability
• Continuous lengths up to 5 mtrs long for slit coils.• Fabricated gaskets to customer’s drawings.• Can be tted with compression limit stops or collars.• Easily assembled using the self-adhesive backing
option. (Self-adhesive backing is an assembly aid only).
• A broad range of sizes available.• A large range of materials to suit many
climatic conditions.
• Large fabricated gaskets can be producedeconomically.
• UL ame retardant approved materials
are also available.
Design Considerations
• It is important that this material is not over-compressed. If the design of the equipment
does not allow for any mechanical method of
preventing over-compression, the gasket should be fitted with built-in compression limiters, either metal
stops fitted to the gasket, or metal collars fitted into
each fixing hole.• When specifying die cut gaskets minimum material
width should not be less than 2mm or at least the
material thickness in any part of the gasket. If thiscannot be achieved around fixing holes consider usinga slot. Particular attention is required if specifying
compression collars in holes.
• Particular consideration must be given to compressionforces, hole centres, size and number of fixings and
rigidity of mating flanges.
NoticeInformation supplied in these data sheets is based on independent
and laboratory tests which Kemtron believes to be reliable.
Kemtron has no control over the design of customer’s product which
incorporates Kemtron’s products, therefore it is the responsibility of the
user to determine the suitability for his particular application and we
recommend that the user make his own test to determine suitability.
The product described in this data sheet shall be of standard quality,
however the products are sold without warranty of fitness for
a particular purpose, either expressed or implied, except to the
extent expressly stated on Kemtron’s invoice, quotation or order
acknowledgement. Kemtron does not warrant that products described
in this data sheet will be free of conflict with existing or future patentsof third parties. All risks of lack of tness, patent infringement and
Kemtron Form-in-Place (FIP) Elastomer compounds are directly dispensedonto component hardware or enclosure via a pressurised fluid dispensingsystem on a numerically controlled XYZ table to form a gasket for dust andmoisture sealing. The dispensing machine deposits the gasket by followinga pre-determined CNC path to provide accuracy and repeatability.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
The process advantages are:
• Component provides an integratedenvironmental gasket.
• Assembly time is reduced as gasket is included
on component.• Rapid prototyping.• Low setup costs.
• Smaller gasket land required.• No material waste.• Can be applied to metal and plastic components.
ApplicationsSuited to applications where small, intricate gasketproles are required, such as on multi-compartment
labyrinth housings with minimum gasket land areawhere traditional larger types of gasket are not suitable.
This process also negates the assembly costs associated
with traditional gaskets as the Form-in-Place gasketbecomes an integral part of the housing or enclosure.
The process is suitable for depositing on both metal and
metallised plastic components/housing.
Availability
Kemtron can dispense FIP gaskets directly onto the
customer’s free issue hardware or can procure thecomponent hardware thereby reducing the customer’ssupply base.
Design Considerations• The gasket height can be specied between 0.4mm to
2.0mm, gasket width will typically be 1.5x the gasketheight.
• Recommended gasket compression is between 20%
and 30%. Over-compression can damage the gasketand as compression stops cannot be incorporatedinto the gasket they should be designed into the
component hardware.• Gasket path for the deposition can be determined from
a sample part, drawings or CAD les.
Production CapabilityTo meet the varying demands of customer requirementsKemtron has developed its own CNC Form-in-Place
dispenser. FIP gasketing work has become a regularfeature of our production work and we are able toprovide a reliable, accurate and quick response to even
high volume orders.
Kemtron has a large range of compounds suitable formany climatic conditions. Wide temperature range,
Kemtron’s experience in the manufacture of Silicone ‘O’ rings is extensive,our preferred method of production is extruded and vulcanised. We have alarge selection of vulcanising tools to suit our standard extrusions.
The jointing process uses the same polymer compound ensuring gasketintegrity is maintained across the joints.
Moulded versions are available if specifically requested.
Both silicone & fluorosilicone are available for the manufacture of ‘O’ ringsin solid cord, tube and sponge. Please note that fluorosilicone is notavailable in sponge.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Advantages Of Vulcanised ‘O’ Rings• Cost effective.• No tooling costs.• Reduced lead times.
• Better surface nish (zero ash).• Allows hollow sections and sponge to be used for
lower compression force.
• Custom sizes are easily produced with restriction on
developed length.• Tight tolerances on developed length and cross
section.• Vulcanised ‘O’ rings with a ID as small as 10mm
depending on cord diameter.
Design Considerations• When selecting a prole it is important to give
attention to the mechanical design of your product.Round and D section seals should ideally be mountedin a suitably sized groove.
• If the gasket is to t in a groove. It is important thatthe gasket size chosen does not overll the channel,when using solid sections you should ensure that
the groove cross sectional area is a minimum of 5%greater than the proposed gasket cross section.• Attention must also be paid to the closing force
required to compress the gasket to the workingheight required.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk
Technical Specifications
Tolerances
Solid silicone cord and tube cross sectionUp to 2.0mm ± 0.15mm
2.0mm to 5.0mm ± 0.25mm5.0mm to 9.0mm ± 0.50mm
Silicone sponge cord cross section
Up to 3.0mm ± 0.25mm3.0mm to 5.0mm ± 0.50mm
6.0mm to 9.0mm ± 0.80mm
Developed Length
± 1.5mm = less than ±0.5mm on diameter
Cross Sections Minimum Inside Diameter of ‘O’ Ring
1.00mm 10mm
1.20mm 10mm
1.30mm 10mm
1.40mm 10mm
1.50mm 10mm
1.60mm 10mm
1.80mm 11mm
2.00mm 12mm
2.20mm 12mm2.40mm 12mm
2.50mm 12mm
2.60mm 12mm
2.80mm 16mm
3.00mm 16mm
3.20mm 16mm
3.50mm 19mm
3.80mm 22mm
4.00mm 22mm
4.30mm 25mm
4.50mm 25mm
4.80mm 28mm
5.00mm 30mm
Gasket Groove Sizes
15% Compression 20% CompressionCord Diameter mm Depth Width Depth Width
1.00 0.85 1.10 0.80 1.15
1.50 1.28 1.65 1.20 1.73
1.60 1.36 1.76 1.28 1.84
1.80 1.53 1.98 1.44 2.07
2.00 1.70 2.20 1.60 2.30
2.40 2.04 2.64 1.92 2.76
2.50 2.13 2.75 2.00 2.88
3.00 2.55 3.30 2.40 3.45
3.20 2.72 3.52 2.56 3.68
3.50 2.98 3.85 2.80 4.03
3.80 3.23 4.18 3.04 4.37
4.00 3.40 4.40 3.20 4.60
4.50 3.83 4.95 3.60 5.18
4.80 4.08 5.28 3.84 5.525.00 4.25 5.50 4.00 5.75
5.50 4.68 6.05 4.40 6.33
6.00 5.10 6.60 4.80 6.90
6.30 5.36 6.93 5.04 7.25
6.50 5.53 7.15 5.20 7.48
The above cross sectional area groove sizes allow for thefree movement of the gasket when being compressed.This method of calculation ensures that the volume of
the gasket does not exceed that of the groove whenfully compressed, resulting in groove overfill. This alsominimises the amount of compression force required to
achieve a good seal.
It is important to note that when designing in a gasket,that the principles of O ring design for pressure sealing
do not apply. The groove depth dimension is the mostimportant, as it is this that limits the gasket compression.The groove width has no maximum dimension and is
only there for gasket location purposes. Tighter groovedimensions using volume calculations may be employedto enhance environmental sealing. However this willincrease the compression forces required.
The above calculations are based on reducing the depthof the groove by a given compression % and increasingthe width by the same amount less 5% eg. 20%
reduction in depth 15% increase in width.
When choosing a tube section as a gasket it isrecommended that consideration be given to the lower
compression forces, making sure that there is enoughresilience in the gasket to ensure a good seal. In thesecases it is sometimes better to use the volume groove
size calculation, with the groove side walls offeringsupport for the tube. Because there are so manyvariables with tube cross sections it is difficult to give
precise information on this subject. Kemtron are able tosupply samples for evaluation purposes.
Kemtron’s wealth of experience in profile design has enabled us to build aportfolio of extrusions suitable for a wide variety of applications. Over theyears many custom sections have been successfully developed to meetdemanding applications from customers world-wide. In addition our abilityto fabricate, self-adhesive back and join materials broadens the applicationswhere extruded profiles can be used.
We stock many standard size sponge cords typically from 1.6mm to up to
9.5mm dia, in Silicone SP16, Neoprene & EPDM, along with similar sizetube profiles in solid Silicone. In addition our in house compounding andextrusion facility enables us to run materials to customer specificrequirements such as Fluorosilicone. We also have a ‘D’ section rangewhich is available in silicone sponge SP16 & SP16 V0 and hollow ‘D’solid silicones.
As our stock on these products is constantly changing please contact uswith your specific requirements and we will do our best to oblige.
19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E [email protected], www.kemtron.co.uk