O-Rings are round rubber washers that are placed around the valve stem in order to create a seal, preventing leaking from occurring and providing an excellent resistance to vibration. The listed size is referenced from AS568 dimensions, which is the Aerospace Size Standard for O-rings from the Society of Automotive Engineers.
Ethylene Propylene Specs:
- ASTM D 1418 Designations: EP, EPM, EPDM
- ASTM D 2000, SAE J200 Type/Class: AA, BA, CA, DA
- General Temperature Range: -65 to +300 Degrees (F)
FKM Performs Well In:
- Alcohols
- Automotive brake fluids
- Dilute acids & dilute alkalies
- Ketones (MEK, acetone)
- Silicon oils & greases
- Steam (up to 400 F, 204 C)
- Water
EPM Does Not Perform Well In:
- Aliphatic & aromatic hydrocarbons
- Di-ester based lubricants
- Halogenated solvents
- Petroleum oils
