EPDM O-Ring Material Description


Black O-RingEthylene Propylene Rubber (EPR) is a Copolymer of ethylene and propylene. Furthermore, EPDM is a terpolymer of ethylene and propylene with a small amount of a third monomer (usually a diene) to permit vulcanization with sulfur. EPDM o-rings are useful for a number of industries from automobile assembly to water purification systems.

Generally, EPDM o-rings are known to possess excellent resistance to ozone, sunlight, and weathering, and has very good flexibility at low temperature, good chemical resistance (many dilute acids and alkalis as well as polar solvents), and good electrical insulation property. EPDM o-rings may also come in a metal detectable variation while retaining the same qualities as the general EPDM o-ring compound. EPDM o-rings are typically black in color, with a long-lasting shelf life.

Cure System: Peroxide-Cured

Standard EPDM o-ring compounds are usually sulfur-cured. Sulfur-cured compounds offer better flexible properties but are more prone to hardening and have an inferior compression set with high temperatures.

Peroxide-cured EPDM o-ring compounds have better heat resistance and a lower compression set. It complies with long-time usage, especially for hose systems in the construction industry, but is more expensive and more difficult for production than the sulfur-cured EPDM o-ring compounds. For more information on EPDM cure systems, click here.

EPDM O-Ring Temperature Range:

Standard Low Temp: -55°C (-67°F)

Standard High Temp: 125°C (257°F)

SPEC SHEET: Ethylene Propylene Diene Monomer (EPDM) 70 Durometer

SPEC SHEET: Ethylene Propylene Diene Monomer (EPDM) 75 Durometer – Metal & X-Ray Detectable


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Preferred Environments to Use EPDM O-Rings

Performs Well In:

  • Alcohols
  • Automotive brake fluid
  • Ketones
  • Dilute acids and alkalis
  • Silicone oils and greases
  • Steam up to 204.4ºC (400ºF)
  • Water
  • Phosphate ester based hydraulic fluids
  • Ozone, aging, and weathering

Doesn't Perform Well In:

  • Aliphatic and aromatic hydrocarbons
  • Di-ester based lubricants
  • Halogenated solvents
  • Petroleum based oils and greases