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. Generally, EPDM o-rings possess an 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 are preferable for use with alcohols, ketones, brake fluids, water, steam (up to 400ºF), dilute acids and alkalis, silicone oils and greases, phosphate ester-based hydraulic fluids, and conditions requiring weather resistance. EPDM o-rings are not preferable for use with petroleum-based oils and greases, halogenated solvents, di-ester based lubricants, and aliphatic and aromatic hydrocarbons.

Cure system: Peroxide-cured

Standard EPDMs 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 temperature. Peroxide-cured EPDMs 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 EPDMs.

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


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