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Rubber compatibility
For Rubber compatibility different greases and rubber types were analyzed by placing the rubber sample covered with grease in the oven at 80C for 7 days. Per definition Compatible is below + 8 % / - 4 % for elastomers weight change.
Ester Grease PFPE Grease 1
Silicone grease PFPE Grease 2
NBR weight change
26,41% 0,05% -0,15% -0,07%
Shore A change
-36 -3
-1 -4
EPDM weight change
31,58% 0,07% -8,10% -0,01%
Shore A change
-25 0
13 0
FKM weight change
-0,28% 0,04% -0,52% -0,04%
Shore A change
3 3
2 1
Si-Rubber weight change
1,86% 0,67% 8,01% 0,27%
Shore A change
0 3
-4 5
Silicone Rubber Tests with different lubricants
Grease A Grease B
Grease C Grease D
Grease Base oil Fluorosilicone Fluorosilicone
Silicone Silicone
Grease thickener
PTFE
Special polyurea
Lithium
Silica
Change in weight -0.12% -0.16%
9.24% 10.28%
Shore A hardness
52 51
46 49
Tensile strength (MPa)
8.15 8.96
7.31 6.73
Original rubber, 7d@80C
Original rubber (without thermal treatment)
-0.16%
53
8.02
57
8.95
Silicone rubber: MVQ 60 M210 black (Kokai) Test parameters: 7 days, 80C