-
BRITISH STANDARD BS EN ISO 8503-5:2004 BS 7079-C5:2004
Incorporating Amendment No. 1 to BS ISO 8503-5:2003 (renumbers the
BS ISO as BS EN ISO 8503-5:2004)
Preparation of steel substrates before application of paints and
related products — Surface roughness characteristics of
blast-cleaned steel substrates —
Part 5: Replica tape method for the determination of the surface
profile
The European Standard EN ISO 8503-5:2004 has the status of a
British Standard
ICS 25.220.10
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BS EN ISO 8503-5:2004
This British Standard was published under the authority of the
Standards Policy and Strategy Committee on 7 November 2003
© BSI 8 February 2005
ISBN 0 580 42899 0
National forewordThis British Standard is the official English
language version of EN ISO 8503-5:2004. It is identical with ISO
8503-5:2003.
The UK participation in its preparation was entrusted to
Technical Committee STI/21, Surface preparation of steel, which has
the responsibility to:
A list of organizations represented on this committee can be
obtained on request to its secretary.
Cross-referencesThe British Standards which implement
international or European publications referred to in this document
may be found in the BSI Catalogue under the section entitled
“International Standards Correspondence Index”, or by using the
“Search” facility of the BSI Electronic Catalogue or of British
Standards Online.
This publication does not purport to include all the necessary
provisions of a contract. Users are responsible for its correct
application.
Compliance with a British Standard does not of itself confer
immunity from legal obligations.
— aid enquirers to understand the text;
— present to the responsible international/European committee
any enquiries on the interpretation, or proposals for change, and
keep the UK interests informed;
— monitor related international and European developments and
promulgate them in the UK.
Summary of pages
This document comprises a front cover, an inside front cover,
the EN ISO title page, the EN ISO foreword page, the ISO title
page, pages ii to v, a blank page, pages 1 to 7 and a back
cover.
The BSI copyright notice displayed in this document indicates
when the document was last issued.
Amendments issued since publication
Amd. No. Date Comments
15516 8 February 2005 Implementation of the European
Standard
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EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
EN ISO 8503-5
December 2004
ICS 25.220.10
English version
Preparation of steel substrates before application of paints
andrelated products - Surface roughness characteristics of
blast-cleaned steel substrates - Part 5: Replica tape method for
the
determination of the surface profile (ISO 8503-5:2003)
Préparation des subjectiles d'acier avant application
depeintures et de produits assimilés - Caractéristiques de
rugosité des subjectiles d'acier décapés - Partie 5: Méthodede
l'empreinte sur ruban adhésif pour la détermination du
profil de surface (ISO 8503-5:2003)
Vorbereitung von Stahloberflächen vor dem Auftragen
vonBeschichtungsstoffen - Rauheitskenngrößen von
gestrahlten Stahloberflächen - Teil 5: Abdruckverfahrenzum
Bestimmen der Rauheit (ISO 8503-5:2003)
This European Standard was approved by CEN on 21 December
2004.
CEN members are bound to comply with the CEN/CENELEC Internal
Regulations which stipulate the conditions for giving this
EuropeanStandard the status of a national standard without any
alteration. Up-to-date lists and bibliographical references
concerning such nationalstandards may be obtained on application to
the Central Secretariat or to any CEN member.
This European Standard exists in three official versions
(English, French, German). A version in any other language made by
translationunder the responsibility of a CEN member into its own
language and notified to the Central Secretariat has the same
status as the officialversions.
CEN members are the national standards bodies of Austria,
Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATIONC OM ITÉ EUR OP ÉEN DE NOR
M ALIS AT IONEUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any
means reservedworldwide for CEN national Members.
Ref. No. EN ISO 8503-5:2004: E
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I NESO 58-30:52( 400E)
2
Foreword The text of ISO 8503-5:2003 has been prepared by
Technical Committee ISO/TC 35 "Paints and varnishes” of the
International Organization for Standardization (ISO) and has been
taken over as EN ISO 8503-5:2004 by Technical Committee CEN/TC 139
"Paints and varnishes", the secretariat of which is held by DIN.
This European Standard shall be given the status of a national
standard, either by publication of an identical text or by
endorsement, at the latest by June 2005, and conflicting national
standards shall be withdrawn at the latest by June 2005. According
to the CEN/CENELEC Internal Regulations, the national standards
organizations of the following countries are bound to implement
this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 8503-5:2003 has been approved by CEN as EN ISO
8503-5:2004 without any modifications.
EN ISO 8503−5:2004
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INTERNATIONALSTANDARD
ISO8503-5
First edition2003-07-01
Reference numberISO 8503-5:2003(E)
© OSI 2003
Preparation of steel substrates before application of paints and
related products — Surface roughness characteristics of
blast-cleaned steel substrates —
Part 5:Replica tape method for the determination of the surface
profile
Préparation des subjectiles d'acier avant application de
peintures et de produits assimilés — Caractéristiques de rugosité
des subjectiles d'acier décapés —
Partie 5: Méthode de l'empreinte sur ruban adhésif pour la
détermination du profil de surface
BS ISO 8503−5:2003EN ISO 8503−5:2004
Copyright British Standards Institution Reproduced by IHS under
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ISO 8503-5:2003(E)
ii © ISO 3002 – All rithgs reresvde
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ISO 8503-5:2003(E)
© ISO 3002 – r llAithgs reservde iii
Contents Page
1 Scope
....................................................................................................................................................
1
2 Normative references
..........................................................................................................................
1
3 Terms and definitions
..........................................................................................................................
1
4 Principle
................................................................................................................................................
2
5 Apparatus
.............................................................................................................................................
2
6 Maintenance and assurance of calibration for the replica tape
method ........................................ 2
7 Procedure
.............................................................................................................................................
3
8 Specification of acceptable error
.......................................................................................................
3
9 Test report
............................................................................................................................................
3
Annexes
Annex A (informative) Measurement errors associated with replica
tape determination of profile ..... 5
Annex B (informative) Guidance on the correspondence between
replica tape and ISO comparator determinations of profile
.............................................................................................................................
6
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ISO 8503-5:2003(E)
iv © ISO 3002 – All rithgs reresvde
Foreword
ISO (the International Organization for Standardization) is a
worldwide federation of national standards bodies(ISO member
bodies). The work of preparing International Standards is normally
carried out through ISOtechnical committees. Each member body
interested in a subject for which a technical committee has
beenestablished has the right to be represented on that committee.
International organizations, governmental andnon-governmental, in
liaison with ISO, also take part in the work. ISO collaborates
closely with the InternationalElectrotechnical Commission (IEC) on
all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules
given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare
International Standards. Draft International Standardsadopted by
the technical committees are circulated to the member bodies for
voting. Publication as anInternational Standard requires approval
by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements
of this document may be the subject of patentrights. ISO shall not
be held responsible for identifying any or all such patent
rights.
ISO 8503-5 was prepared by Technical Committee ISO/TC 35, Paints
and varnishes, Subcommittee SC 12,Preparation of steel substrates
before application of paints and related products.
ISO 8503 consists of the following parts, under the general
title Preparation of steel substrates beforeapplication of paints
and related products — Surface roughness characteristics of
blast-cleaned steelsubstrates:
— Part 1: Specifications and definitions for ISO surface profile
comparators for the assessment of abrasiveblast-cleaned
surfaces
— Part 2: Method for the grading of surface profile of abrasive
blast-cleaned steel — Comparator procedure
— Part 3: Method for the calibration of ISO surface profile
comparators and for the determination of surfaceprofile — Focusing
microscope procedure
— Part 4: Method for the calibration of ISO surface profile
comparators and for the determination of surfaceprofile — Stylus
instrument procedure
— Part 5: Replica tape method for the determination of the
surface profile
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ISO 8503-5:2003(E)
© ISO 3002 – r llAithgs reservde v
Introduction
The performance of protective coatings of paint and related
products applied to steel is significantly affected bythe state of
the steel surface immediately prior to painting. The principal
factors that are known to influence thisperformance are:
a) the presence of rust and mill scale;
b) the presence of surface contaminants, including salts, dust,
oils and greases;
c) the surface profile.
International standards ISO 8501, ISO 8502 and ISO 8503 have
been prepared to provide methods ofassessing these factors, while
ISO 8504 provides guidance on the preparation methods that are
available forcleaning steel substrates, indicating the capabilities
of each in attaining specified levels of cleanliness.
These International Standards do not contain recommendations for
the protective coating systems to be appliedto the steel surface.
Neither do they contain recommendations for the surface quality
requirements for specificsituations, even though surface quality
can have a direct influence on the choice of protective coating to
beapplied and on its performance. Such recommendations are found in
other documents, such as nationalstandards and codes of practice.
It will be necessary for users of these International Standards to
ensure thatthe qualities specified are
— compatible and appropriate both for the environmental
conditions to which the steel will be exposed and forthe protective
coating system to be used;
— within the capability of the cleaning procedure specified.
The four International Standards referred to above deal with the
following aspects of preparation of steelsubstrates:
ISO 8501 — Visual assessment of surface cleanliness;
ISO 8502 — Tests for the assessment of surface cleanliness;
ISO 8503 — Surface roughness characteristics of blast-cleaned
steel substrates;
ISO 8504 — Surface preparation methods.
Each of these International Standards is in turn divided into
separate parts.
It is important to note that numerical characterization of a
surface profile is meaningful only when accompaniedby an
understanding of the errors of measurement and by the realization
that different techniques may yieldsomewhat different numerical
values for the profile. Estimates of measurement error associated
with differenttechniques can be obtained from national or
international standards or from the equipment manufacturers.
Asshown in Annex B, values given by the replica tape method align
well with those obtained using other parts ofISO 8503.
Information regarding the magnitude of errors associated with
use of replica tape is given in Annex A.
NOTE Advantages of the replica tape method include the fact that
it affords numerical characterization, yields a permanentrecord,
works well on curved surfaces and benefits from a geographically
broad base of user experience over a period ofseveral decades.
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blank
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ANRETNIITOTS LANDNADRA OSI -30583002:5)E(
© ISO 3002 – r llAithgs reservde 1
Preparation of steel substrates before application of paints and
related products — Surface roughness characteristics of
blast-cleaned steel substrates —
Part 5:
Replica tape method for the determination of the surface
profile
1 Scope
This part of ISO 8503 describes a field method for measuring the
surface profile produced by any of theabrasive blast-cleaning
procedures given in ISO 8504-2. The method uses replica tape and a
suitable gauge formeasuring, on site, the roughness of a surface
before the application of paint or another protective coating.
The method is applicable within the range of profiles cited for
a given grade (or thickness) of replica tape. Thecommercial grades
currently available permit measurement of average peak-to-valley
profiles of to
. The method is valid for surfaces that have been cleaned with
either metallic or non-metallic abrasives.
2 Normative references
The following referenced documents are indispensable for the
application of this document. For datedreferences, only the edition
cited applies. For undated references, the latest edition of the
referenced document(including any amendments) applies.
ISO 4618 (all parts), Paints and varnishes — Terms and
definitions for coating materials
ISO 8503-1, Preparation of steel substrates before application
of paints and related products — Surfaceroughness characteristics
of blast-cleaned steel substrates — Part 1: Specifications and
definitions for ISOsurface profile comparators for the assessment
of abrasive blast-cleaned surfaces
ISO 8503-3, Preparation of steel substrates before application
of paints and related products — Surfaceroughness characteristics
of blast-cleaned steel substrates — Part 3: Method for the
calibration of ISO surfaceprofile comparators and for the
determination of surface profile — Focusing microscope
procedure
ISO 8503-4, Preparation of steel substrates before application
of paints and related products — Surfaceroughness characteristics
of blast-cleaned steel substrates — Part 4: Method for the
calibration of ISO surfaceprofile comparators and for the
determination of surface profile — Stylus instrument procedure
ISO 8504-2, Preparation of steel substrates before application
of paints and related products — Surfacepreparation methods — Part
2: Abrasive blast-cleaning
3 Terms and definitions
For the purposes of this document, the terms and definitions
given in ISO 4618 and ISO 8503-1 apply.
20 µm115 µm
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ISO 8503-5:2003(E)
2 © ISO 3002 – All rithgs reresvde
4 Principle
The replica film in replica tape consists of a layer of
crushable plastic microfoam coated onto a polyestersubstrate of
highly uniform thickness ( ). When compressed against a hard
surface, themicrofoam collapses to about of its original
thickness.
NOTE 1 When the replica film is coated with a thin ( ) layer of
a ductile and optically reflective metal, such as indium,the
replicated surface can be studied with an optical interferometric
profiler. When the film is coated with a similarly thin layerof a
ductile and electron-emissive metal, such as gold, platinum or
palladium, the replica may be studied with an
electronmicroscope.
NOTE 2 This method measures an “average maximum peak-to-valley
profile” because the anvils of the micrometer gaugeflatten the
replica profile slightly so that the reading equates to an average
maximum value, though this is not the same as amathematical
average.
5 Apparatus
5.1 Replica tape, consisting of a square piece of replica film
(measuring approximately along eachside) attached to
adhesive-backed paper tape. The film shall be mounted over a hole
(approximately indiameter) in the centre of a section of the paper
tape (approximately in size), which is printedwith the grade of
tape and the corresponding range of profiles.
NOTE 1 Grades of replica tape are available for measurement of
profiles between and , between and, and between and .
The tape's adhesive backing prevents movement of the replica
film during the test and allows the sampleidentification and
measured profile to be recorded.
NOTE 2 The microfoam can be compressed and should therefore be
handled with care, especially when measuring itsthickness.
5.2 Micrometer gauge: Use a spring-loaded instrument
specifically designed for use with replica tape, havinga closing
force of and an accuracy of or better. The anvils shall be circular
with the upper anvilhaving a diameter of and the lower face being
the same size or larger.
5.3 Compression tool, consisting of a moulded plastic rod with a
spherical head (nominal diameter )that is used to compress the
replica film against the surface to be measured.
6 Maintenance and assurance of calibration for the replica tape
method
Each component of the replica tape has its own storage life and
effective operating temperature, with the replicafilm being much
more durable than the adhesive-backed paper tape.
Testing has shown that replica film is able to produce accurate
replicas on surfaces with temperatures over atleast the range
between and . At typical room temperatures, it is believed that
replicas willstore well for years, whilst uncompressed film may be
stored for decades. In addition, the uncompressed filmhas never
been seen to fail, despite prolonged storage, at temperatures over
the range between and
. However, the adhesive backing on the paper tape can
deteriorate.
Replica tape should be stored at room temperature; prolonged
storage of replica tape outside the range to for more than two
years is not recommended.
The measuring gauge, whilst rugged, should be treated with the
usual level of care associated with a precisioninstrument. The
gauge shall be calibrated against appropriate standards at regular
intervals in accordance withthe manufacturer's instructions. The
calibration shall then be checked by measuring a known
thickness.
Information on the correlation of ISO comparator measurements
with those obtained by replica tape is given inAnnex B.
50 µm ± 2 µm25 %
80 nm
10 mm10 mm
53 mm× 19 mm
20 µm 50 µm 33 µm85 µm 40 µm 115 µm
1,5 N ± 5 µm6,3 mm
9 mm
− 10 ◦C + 65 ◦C
− 10 ◦C+ 65 ◦C
5 ◦C30 ◦C
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ISO 8503-5:2003(E)
© ISO 3002 – r llAithgs reservde 3
7 Procedure
Select a representative area of the surface for measurement.
Select the appropriate grade (thickness) of replica tape.
Prepare the micrometer gauge by cleaning the anvils and
adjusting the zero point to read , thethickness of the
incompressible polyester substrate. This initial adjustment
automatically subtracts the thicknessof the substrate from all
subsequent readings. Before use, the calibration of the gauge shall
be checked with acalibrated shim of thickness comparable to that to
be measured and, if the results fall outside the limits ofaccuracy
specified by the manufacturer, the instrument shall not be
used.
Remove a single piece of replica tape from its release paper.
Apply it to the blast-cleaned surface and rub thecompression tool
(5.3) over the replica film in the centre of the tape, using firm
pressure. The replica film willbecome darker as the surface is
replicated and the entire circular area should be darkened
uniformly.
Remove the tape from the surface and place the replica between
the anvils of the measuring gauge, makingsure that it is centred
properly. Release the measuring gauge gently onto the replica and
measure the profile.The gauge reading is the average maximum
peak-to-valley distance on the blast-cleaned surface.
The number of measurements shall be agreed between the
interested parties.
Attach the properly annotated tape to the test report and record
the measurements as appropriate.
NOTE 1 Before the surface under test is measured, the accuracy
of this method may be checked by measuring a knownprofile, such as
an ISO comparator.
NOTE 2 The same procedure is used for measuring gauges that read
in non-SI units, such as mils or thous (thousandthsof an inch; or
thou ). Gauges calibrated in non-SI units are supplied with
instructions appropriate to thoseunits.
8 Specification of acceptable error
An essential part of any specification relating to surface
profile is an explicit statement of how the surface profilewas
determined. Implicit in this specification is an understanding of
both the precision and the accuracyassociated with a given method
of measuring the profile. A discussion of error associated with
replica tapemeasurements is given in Annex A.
The number of readings to be taken and the range of acceptable
profiles shall be agreed between the interestedparties before
measurement starts.
9 Test report
The test report shall contain at least the following
information:
a) all the information needed for the identification of the
sample tested;
b) a reference to this part of ISO 8503 (ISO 8503-5), including
its year of publication;
c) the individual sections of tape bearing the surface replicas
(the designation of the test area and themeasured profile shall be
recorded on each section and the replicas shall be grouped in the
test report bymeasurement location);
d) the result(s) of the test;
e) the work site identification and project name (if
applicable);
f) the date of the test;
g) the name of the operator;
−50 µm
1 mil ≈ 25,4 µm
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ISO 8503-5:2003(E)
4 © ISO 3002 – All rithgs reresvde
h) any deviations from the procedure;
i) any unusual features observed.
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ISO 8503-5:2003(E)
© ISO 3002 – r llAithgs reservde 5
Annex A(informative)
Measurement errors associated with replica tape determination of
profile
In 1987, a panel of experts convened by NACE International
(National Association of Corrosion Engineers)investigated the
measurement properties of replica tape. NACE Standard RP 0287
addressed the issue ofrepeatability and accuracy of measurement and
reported the results of round-robin tests in which 14 blastedpanels
were measured by seven observers. Replica tape and focusing
microscope measurements agreedwithin their confidence limits (two
standard deviations) in 11 of 14 cases. The average difference
betweenthe two types of measurement technique was . It should be
noted that some difference is to be expected,based on the fact that
the techniques have differing maximum peak-to-valley evaluation
distances, evaluationareas and approaches to averaging. This is
further discussed in Annex B.
The standard deviation for measurements made by the seven
observers, averaged over all fourteen panels, was. The standard
deviation for the corresponding focusing microscope profile
determinations, averaged
over all fourteen panels, was .
Confidence intervals comprising two standard deviations (
confidence) are commonly specified. Astandard deviation of implies
that a single replica tape measurement, by an arbitrary observer,
has a
probability of lying within (two standard deviations) of the
nominal replica tape profile.
Independent tests show the standard deviation for measurements
performed by a single observer to be .
95 %4,5 µm
5,4 µm8,1 µm
95 %5,4 µm
95 % 10,8 µm
3,6 µm
3002:5−3058 OSI SBEN ISO 8503−5:2004
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ISO 8503-5:2003(E)
6 © ISO 3002 – All rithgs reresvde
Annex B(informative)
Guidance on the correspondence between replica tape and ISO
comparator determinations of profile
B.1 Replica tape
A single replica tape measurement samples a circular patch in
diameter and in area. Flexing ofthe polyester substrate and the
curvature of the compression ball cause the film to conform to the
surface overdistances greater than . Within patches smaller than
approximately , the portion of the ballpressing the film against
the surface is effectively flat. These patches constitute the
sampling area for individualmaximum peak-to-valley determinations.
(In fact, the evaluation areas overlap so there is multi-patch
correlationand the sampling process is somewhat more complex.) A
measurement using the micrometer gaugeapproximates the average
maximum peak-to-valley heights over all the sampling areas in the
areaevaluated.
B.2 Focusing microscope
A single maximum peak-to-valley measurement using a focusing
microscope covers a sampling region with adiameter of and an area
of approximately . Taking the average of the maximum
peak-to-valleydistances from twenty of these regions, as specified
in ISO 8503-3, gives a total evaluation area ofapproximately .
B.3 Stylus device
The sampling length for this method, i.e. the distance over
which individual maximum peak-to-valley distancesare measured, is
and there are five such lengths in a single traverse of the stylus.
For a stylus point witha diameter of , the area evaluated on each
traverse will be . Taking the average of themaximum peak-to-valley
distances from (a minimum of) ten traverses, as specified in ISO
8503-4, gives50 sampling lengths with a total area of .
B.4 Comparison of different methods
A comparison of profile readings obtained using various ISO
methods is given in Figure B.1.
6,3 mm 31 mm2
0,4 mm 0,4 mm
31 mm2
0,5 mm 0,2 mm2
4 mm2
2,5 mm10 µm 0,125 mm2
1,25 mm2
3002:5−3058 OSI SBEN ISO 8503−5:2004
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ISO 8503-5:2003(E)
© ISO 3002 – r llAithgs reservde 7
Key
replica tape measurementsreplica tape averages
comparator (nominal spec)
comparator (microscope)
comparator (stylus)
1 grit-blasted surfaces
2 upper limit for XC replica tape
3 shot-blasted surfaces
Figure B.1 — Comparison of profile readings using various ISO
methods
3002:5−3058 OSI SBEN ISO 8503−5:2004
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BS EN ISO 8503-5:2004 BS 7079-C5:2004
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bsiso.pdfiso.pdfTitlePage - Preparation of steel substrates
before application of paints and related products�—
S...TableofContent - Contents PageForeword - ForewordIntroduction -
IntroductionScope - 1��� ScopeNormativeReference - 2��� Normative
referencesClause1 - 4��� PrincipleClause1 - 5���
ApparatusUntitledSubclause2 - 5.1��� Replica tapeUntitledSubclause2
- 5.2��� Micrometer gaugeUntitledSubclause2 - 5.3��� Compression
tool
Clause1 - 6��� Maintenance and assurance of calibration for the
replica tape methodClause1 - 7��� ProcedureClause1 - 8���
Specification of acceptable errorClause1 - 9��� Test report
AnnexInformative - Measurement errors associated with replica
tape determination of profileAnnexInformative - Guidance on the
correspondence between replica tape and ISO comparator
determi...Clause1 - B.1��� Replica tapeClause1 - B.2��� Focusing
microscopeClause1 - B.3��� Stylus deviceClause1 - B.4��� Comparison
of different methods