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Ethylene Propylene O-rings
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Ethylene Propylene O-rings

Parco’s ethylene-propylene (EPDM) O-rings provide superior resistance to water and steam, alcohols, glycol engine coolants and similar polar fluids. EPDM is not recommended for petroleum based fluids and fuels.

Individual EPDM compounds have service temperatures within the range from -65 to +300°F, including certain compounds formulated for higher temperatures. Parco’s most popular high performance EPDM compounds for O-rings are listed below.

Elastomer Compound Durometer
(Shore A)
Color Key Properties
Ethylene-propylene 5778 70, 80, 90 Black Internally lubricated; peroxide-cured; NSF-61 listed; FDA-conforming
Ethylene-propylene 5611-80 80 Black Peroxide-cured; MIL R 3065 compliant

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