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 have very good flexibility at low temperatures, good chemical resistance (many dilute acids and alkalis as well as polar solvents), and good electrical insulation properties. 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 back 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 in high temperatures.

Peroxoide-cured EPDM o-ring compounds have better heat resistance and a lower compression set. They are suitable for long-term usage, especially for hose systems in the construction industry, but they are more expensive and difficult to produce than sulfur-cured EPDM o-ring compounds. For more information on EPDM cure systems, click here.

EPDM O-Ring Compounds

Temp Range (F)
Data Sheet
E70101 70


-67 to +257 General purpose
E70116 70


-67 to +302 NSF 61
E70118 70


-67 to +257 FDA Compliant, NSF 61
E70771 70


-67 to +257 USP Class VI Certified, ISO 10993-5 Compliant, Internally Lubed
E75YL12 75


-67 to +257 Metal/X-ray detectable, FDA-Grade
E90192 90


-22 to +302 R744 Refrigerant Compatible

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Preferred Environments to Use EPDM O-Rings

Performs Well In:

  • Alcohols
  • 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