Vamac® & Viton® performance in new automotive fluids DuPont Performance Polymers Conference DuPont Performance Polymers Conference May 20 May 20 th, th, 2010 2010 Albergo Albergo Cocca Cocca Hotel Hotel Sarnico Sarnico ( ( Bg Bg ) ) Patrick Patrick Paglia Paglia & Laurent Lefebvre & Laurent Lefebvre
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Vamac® & Viton® performance in new automotive fluids Vamac Viton performance in new...Vamac® & Viton® performance in new automotive fluids DuPont Performance Polymers Conference
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Vamac® & Viton® performancein new automotive fluids
Viton TBR-S (=VTR-8802) was currently a development for US OEMs for some highly aggressive wheel and axle lubesSo far limited interest for the European market
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Viton® in demanding lubricantsAutomatic Transmission Fluid @ 150°C
•Pure & Fresh Biodiesel is not agressive to FKM compounds
•High Swell of standard FKM is caused by a seconder order effect:- Contamination (water, residual catalyst, …)
- Degradation products (acids, aldehydes, …)
Viton® performance in “pure & fresh” Biodiesel
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fuel change at test interval
0
20
40
60
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120
"NMO" GBL-S "NMO" GF-S GBL-S
Ca(OH)2
A401C F605C
Vo
lum
e C
han
ge, %
336 hours
672 hours
1008 hours
1512 hours
2016 hours
3024 hours
Wet = addition of 0.5% distilled water to RME
"NMO"= No Metal Oxide formulation
Viton® performance in “aggressive” Biodiesel
Aged in “wet” B100 RME at 125°C – Volume change (%)
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Viton® performance in “aggressive” Biodiesel
Aged in “wet” B5 RME at 125°C – Volume change (%)
No Metal Oxidein compounds
Presence of metal oxide
Best recommendation : Viton® APA peroxide cured without metal oxide
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Vamac® results in Fam-B & in Biodiesel
*Significant swell and property loss in gasoline
*After redrying, properties go back to original excellent value
*Swell can be reduced only to a limited extent with Vamac® GLS & VMX 3110
*2% and 5% blends of biodiesel fuels are compatible with Vamac® G
*For the 20% blend use of Vamac® GLS is appropriate
Vamac® volume swell after 1 week @ 23°Cin Fuel/RME Biodiesel
0
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120
0 10 20 30 40 50 60 70 80 90 100
% RME in the blend Fuel #2 + RME
% V
olu
me
Sw
ell
.
G standard
G/GLS (50/50) standard
GLS standard
Vamac® & Viton® performance to :
1. Engine & Transmission Synthetic Oils
2. Biofuels
3. Blow-By & Exhaust Gas Acid Condensates
4. AdBlue® Urea
Agenda
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Why Vamac® for Blow-By Applications ?
ECO is the polymer that was traditionally used in PCV tubes. Problems of ECO:
- Lead is used as stabilizer
- Poor heat resistance or scorch issue with ECO lead free
- Acid resistance limited
0.0%
20.0%
40.0%
60.0%
80.0%
100.0%
120.0%
1
Rete
nti
on
of
Elo
ng
ati
on
, %
Vamac® G
Vamac® GLS
ECO ( Lead-Free )
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140
1
Volu
me S
well, %
Vamac® G
Vamac® GLS
ECO ( Lead-Free )
Vamac® G Vamac® GLS
ECO
ECO & Vamac® after 1 week @ 90°C
Swell in Blow-By condensate from Ford
ECO & Vamac® after 1 week @ 90°C
Elongation Retention in Ford‘s Acid Condensate
Ford acid condensate chemical composition:14.0 ml Methanoic ( Formic ) Acid 11.0 ml Nitric Acid15.0 ml Ethanoic ( acetic ) Acid 1.0 ml Hydrochloric Acid
1.0 ml Sulphuric Acid 958.0 ml Distilled Water
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Temperature °C
135
60
15
0 6 12 18 24
30 min dry
30 min FAM2
30 min dry
18 h in Cecilia 20, 5W40
4 h HNO³
30 min dry
1 Cycle
VW TL52291, Blow-by specification
PV3936 test conditions
Standard fluid ageing tests in Cecilia 20, Diesel & Fam B are requested in VW TL52291 spec.
PV 3936 is part of air duct specification if resistance to crankcase gases (blow-by gas) and
condensates of these gases are required. Rubber has to pass a number of cycles.
Reflux with stirring system + aeration 200 ml/min,
PSA EGR liquid contact, 168 h @ 90°CReflux with stirring system, no aeration
PSA EGR liquid contact, 168 h @ 90°C
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Acid Resistance Conclusion of DuPont lab study
� ECO, CPE (CM): Can be significantly affected in acid condensates (EGR, Blow-by) �Increased risk of failure for the parts exposed to EGR
� ACM, HT-ACM: Shows severe effects in the various tests�Careful study for each application
� Vamac® AEM : Standard compounds demonstrate excellent resistance to exhaust acids and gases ���� Vamac® can be recommended for cost-effective EGR hose and
sealing solutions
� Viton® FKM: Standard compounds do perform well in these acidic environments,even when highly concentrated and/or at high temperature – caution with organic acids…
���� Viton® recommended broadly for use in contact with EGR.���� Viton® peroxide cured compounds without metal oxide, are the
ultimate choice
Vamac® & Viton® performance to :
1. Engine & Transmission Synthetic Oils
2. Biofuels
3. Blow-By & Exhaust Gas Acid Condensates
4. AdBlue® Urea
Agenda
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AdBlue® System
For elastomeric materials which are used in contact to AdBlue®, additional resistance to Diesel or Engine oils is very often required.
This eliminates non-polar materials like EPDM.
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Vamac® Ageing in AdBlue® for 168 h at 120°C
� Tests were carried out in a lab autoclave using a Kalrez® FFKM seal.
� Vamac® GLS with its high Methyl Acrylate content lost all its elastic properties after 1 week at 120°C.
� Vamac® G is also loosing most of its elastic properties.
� The high viscosity grade Vamac® Ultra IP maintain most of his properties, only the Modulus
shows a significant increase.
� The peroxide cured Vamac® DP performs best in terms of Modulus retention
20157721Weight Change
22168923Volume Change
3480--Delta 100% [%]
2,810,2--Modulus at 100 % [MPa]
-41-28-89-64Delta Elong. [%]
3082212685Elongation at break [%]
1620-79-43Delta TS [%]
11,021,23,59,8Tensile Strength [MPa]
-13-20-1Delta Hardness
61755471Hardness Shore A (1 second)
Vamac®DP
Vamac®Ultra IP
Vamac®GLS
Vamac®GLiquid Phase
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� Vamac® has long-time proven functionality in automotive hoses and seals and meets automotive low- and high-temperature requirements (-40°C to 170°C with peaks up to 200°C), as well as good fluid resistance (e.g. engine oil and Diesel fuel)
� Vamac® Ultra grades at medium methyl acrylate levels (=Vamac® Ultra IP & VMX 3038) keep their elastomeric properties after immersion in AdBlue® for 1 week at 120°C -> other tests with different ageing conditions (80°C, 100°C up to 6 weeks) are in progress
� Peroxide cured Vamac® DP also can be seen as a material with possible use for AdBlue®, with higher comp set results (especially VW comp.set) may however be seen not as good for sealing applications
� Vamac® offers an excellent price/performance ratio compared to HNBR or FKM grades that can be considered suitable for contact to AdBlue®
Vamac® - AdBlue® Summary
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The information set forth herein is furnished free of charge and is based on technical data that DuPont believes to be reliable and falls within the normal range of properties. It is intended for use by persons having technical skill, at their own discretion and risk. This data should not be used to establish specification limits nor used alone as the basis of design. Handling precaution information is given with the understanding that those using it will satisfy themselves that their particular conditions of use present no health or safety hazards. Since conditions of product use and disposal are outside our control, we make no warranties, express or implied, and assume no liability in connection with any use of this information. As with any product, evaluation under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate or a recommendation to infringe on patents.
Caution: Do not use in medical applications involving permanent implantation in the human body. For other medical applications, discuss with your DuPont customer service representative and read Medical Caution Statement H-50103-3.
The DuPont™ Oval logo, DuPont™, The miracles of science™, Crastin®, Delrin®, DuPont™ ETPV, Hytrel®, Minlon®, Rynite®, Thermx®, Zenite®, Zytel®, Diak™, Viton® and Vamac® are registered trademarks of E.I. DuPont de Nemours or its affiliates.