Ethylene-propylene rubber

Ethylene-propylene rubber (EPR, or EPDM,) is a copolymer of ethylene and propylene. It has much of the chemical resistance of the related plastics: excellent resistance to heat and oxidation; good resistance to steam and hot water. It is used as a standard lining material for steam hoses; widely used in chemical services as well, having a broad spectrum of resistance.

An elastomer made by the stereospecific copolymerization of ethylene and propylene. Has no unsaturation; cannot be vulcanized with sulfur but can be cured with peroxides.