Ethylene Propylene (EPDM) O-Rings

Ethylene Propylene (aka EPDM or EP), is a copolymer of both ethylene and propylene - also referred to as Ethylene Propylene Diene Monomer. This elastomer is a good compound for sealing phosphate-ester-based hydraulic fluids, glycol brake fluids, and Skydrol® fluids, which are commonly used in commercial aircraft hydraulic systems. EPDM rubber gives excellent resistance to water, steam, ozone, weathering, and UV sunlight. Not all use cases are great with this material as exposure to petroleum-based fluids and di-ester lubricants will eat away at the material causes the seal and system to fail.

Learn more about EPDM O-Rings in the APG Knowledge Base.

Temperature range of EDPM rubber: -60ºF (-50ºC) up to +250ºF (120ºC)