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Braycote® Vacuum Greases

Elastomer compatibility data for the base fluid


Technical Report

Perfluoropolyether Lubricants

Elastomer Compatibility

The following elastomers were treated at 70°C for 166 hours:

Elastomer
Ultimate
Tensile
Stress
(%)
Ultimate
Elongation
(%)
Modulus
At 200%
(%)
Modulus
At 300%
(%)
Shore
Hardness
(%)
Volume
Change
(%)
Butadiene -
acrylonitrile
rubber (NBR)		 - 5 + 3 - 14 - - - - - - - 0.3
Butyl rubber
(IIR)		 + 7 + 12 - 10 - 7 + 0.7 + 1.5
Cloroprene
rubber (CR)		 + 14 + 18 - - - - - - 0 - 0.5
Ethylene-
propylene-
diens-
terpolymer
(EPDM)		 + 14 + 20 - 11 - 8 + 0.6 - 0.3
Fluorocarbon
rubber (FKM)		 + 5 0 + 2 + 5 + 5.2 + 0.3
Natural rubber
(NR)		 + 6 + 25 - 20 - 15 - 3.9 + 2.0
Polybutadiene
cis rubber
(BR) 		- 17 + 7 - 21 - - - - 4.5 + 8.0
Styrene
butadiene
rubber (SBR)		 + 4 + 38 - 38 - 36 - 3 + 0.8

Elastomer Compatibility



Compounds
Conditions
Results
Aflas 7 ASTM D471-79
150EC @ 500 hrs.		 Tensile = - 10.4%
Elongation = 1.4%
Volume change = - 14.7%
DOW 236 ASTM D 471-79
200EC @ 500 hrs. 		Change in weight = - 5.4%
The material hardened, changed
color from white to brown and
leeched brownish particulate &
globules into the fluid.
EPDM ASTM D471-79
150EC @ 500 hrs. 		Some leeching into fluid.
Compatibility questionable.
Fluorosilicone
60 Duro (XL 2113)		 ASTM D471-79
150EC @ 575 hrs. 		Change in tensile = - 12%
Volume cha nge = - 0.1%
Change in elongation = - 11.5%
Fluorosilicone
70 Duro (XL 2114) 		ASTM D471-79
150EC @ 500 hrs. 		Change in tensile = - 12.5%
Volume change = - 3.5%
Change in elongation = - 17%
Loctite PST (sealant) ASTM D1384-94
150EC @ 336 hrs.
150 ml/min air flow 		Appears compatible. No leeching of
sealant into fluid.
Loctite 7 Ultra Blue (silicone) 125EC @ 100 hrs. Volume change = - 2.6%
Weight change = - 0.2%
Silicone RTV (DOW) rubber 125EC @ 100 hrs. Volume change = - 2.7%
Weight change = - 0.5%
Tecnoflon® FOR 5351 U ASTM D 471-79
150EC @ 100 hrs. 		Tensile = 1%
Elongation = - 1%
Volume Change = 3%
Tecnoflon® P 819 ASTM D 471-79
150EC @ 500 hrs. 		Tensile = 2%
Elongation = - 7%
Volume Change = 11%
Tecnoflon® FOR 439 ASTM D 471-79
150EC @ 500 hrs. 		Tensile = - 13%
Elongation = - 4%
Volume Change = 9%
Tecnoflon® P-710 ASTM D 4 71-79
150EC @ 500 hrs. 		Tensile = - 9.3%
Elongation =
Volume Change = 4.3%
Tecnoflon® 5351 ASTM D 471-79
200EC @ 500 hrs. 		Tensile = - 4.7%
Elongation = 3.9%
Volume Change = 8.5%
Viton® fluoroelastomer A Gasket
(GASKET NOT 100% VITON A)		 ASTM D 471-79
150EC @ 500 hrs. 		0.32% volume swell
Gasket left a lot of filler
Not compatible
Viton® fluoroelastomer V115 (TEC V12)
International Seals		 ASTM D 471-79
150EC @ 850 hrs. 		Volume change = 3.4%
Weight change = 5.5%
Change in Hardness = 0.9%
Tensile change = - 8%
Elongation change = 4.1%

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Sunday July 05, 2009
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