O-Ring ISO-3601

O-Ring AS-568

Ethylene Propylene Diene Monomer Rubber (EPDM)


EPDM is a copolymer of ethylene and propylene, combined with a terpolymer of ethylene, propylene, and a third monomer (usually a diolefin) to permit vulcanization with sulfur. Ethylene Propylene Rubber possesses excellent resistance to ozone, sunlight, and weathering. It also has very good flexibility at low temperatures, has good chemical resistance, and good electrical insulation properties.

Common Uses:

EPDM is found in:

  • Outdoor weather resistant uses
  • Automotive cooling and brake systems
  • Automotive seals
  • Garden and appliance hose, tubing, washers, belts
  • Electrical insulation
  • Solar panel heat collectors
  • Speaker cone surrounds


Standard Compound: -40°C (-40°F) to 125°C (257°F)

Special Compound: -55°C (-67°F) to 150°C (302°F)

Hardness: 30 to 90 Shore A

ASTM D1418 Designation: EPM, EPDM

ASTM D2000 Designation: AA, BA, CA, DA

Standard Colors: Black

Optional Colors:


EPDM’s can be sulfur or peroxide cured which affects the temperature and hardness and compression set properties of the material. Standard EPDM’s are usually sulfur cured which offers better flexibility. Peroxide cured EPDM’s have better heat resistance and lower compression set. EPDM’s often have specialty coatings applied to improve ease of installation or to reduce friction.


EPDM rubber compounds perform well in alcohols, automotive brake fluid, ketones, dilute acids and alkalis, silicone oils and greases, steam to 204°C (400°F), water, phosphate ester based hydraulic fluids Skydrol(R)), ozone, aging and weathering.


EPDM rubber compounds are susceptive to aliphatic and aromatic hydrocarbons, di-ester based lubricants, halogenated solvents, petroleum based oils and greases, and have no resistance to hydrocarbon fluids.

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