EPR & EPDM O-Rings
Ethylene Propylene Rubber (EPR or EPM) is very closely related to EPDM (Ethylene Propylene Diene Monomer). They are functionally the same thing.
Standard Durometer & Colors
EPR O-rings have a standard durometer range of 40–90 Shore A, but most are 70–80 Shore A. They are available in many colors, including high-visibility hues.
Temperature Range for EPR O-Rings
EPR has a temperature range of -50°F to 160°F.
Recommended Use of EPR O-Rings
EPR has good tear resistance, good to excellent abrasion resistance, and fair to good resilience.
- Steam
- Water
- Automotive Brake Fluids.
E refers to ethylene, P to propylene and M refers to the classification in ASTM standard D-1418. There are two slight differences between EPR and EPDM.
EPR Vs. EPDM
There are very few performance differences between EPR and EPDM. Both swell a great deal in petroleum products and are excellent in water, steam, polar solvents, and acetone.
There are some differences in extreme applications: EPR is very tightly cured, and EPDM is suited for the nuclear industry, and for an application that involves concentrated acetic acid. Some EPDM compounds show superior performance to most EPRs, while in other applications, this is almost no difference.
Application & Industries
You can find additional technical information related to this and other materials regarding chemical compatibility, resistance to abrasion, suitability for dynamic or static applications, temperature operating ranges, longevity, and other factors on our Technical Information pages.
As a leading distributor of metric and standard EPR and EPDM o-rings, our team is also ready to answer any questions you have about the recommended use and applications of these rings. Contact us today!