Ethylene Propylene -
Ethylene Propylene Rubber (EPM, EPDM)

Typical Trade Names:

• Nordel - E.I. duPont de Nemours Co.
• Royalene - Uniroyal
• Vistalon - Exxon Chemical Co. USA
• Epsyn - Copolymer Rubber & Chemical Corp.
• Epcar - B.F. Goodrich Co.

Ethylene propylene rubber is an elastomer prepared from ethylene and propylene monomers (ethylene propylene copolymer) and at times with a small amount of a third monomer (ethylene propylene terpolymers). Although EP is a relatively new introduction to the rubber industry (1961), it has won broad acceptance in the sealing world because of its excellent resistance to Skydrol and other phosphate ester type hydraulic fluids. Ethylene propylene has a temperature range of -65 to +300 degrees F (-54 to +149 degrees C) for most applications.

EP is recommended for:

• Phosphate ester base hydraulic fluids (Skydrol, Fyrquel, Pydraul)
• Steam (to 400 degrees F) (204 degrees C)
• Water
• Silicone oils and greases
• Dilute acids Dilute alkalles
• Ketones (MEK, acetone)
• Alcohols
• Automotive brake fluids

EP is not recommended for:

• Petroleum oils
• Di-ester base lubricants

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