乙丙橡胶，有机化合物制品，是橡胶制品工业中一项极为重要的原材料，有多种良好的理化特性。乙丙橡胶又可分为二元乙丙、三元乙丙橡胶、改性乙丙和热塑性乙丙。而三元乙丙橡胶(EPDM)已在汽车密封条行业中得到广泛的应用。

Ethylene propylene rubber (EPR, sometimes called EPM, the E refers to ethylene, P to propylene and M refers to its classification in ASTM standard D-1418 since the M class includes rubbers having a saturated chain of the polymethylene type) is a type of synthetic elastomer that is closely related to EPDM rubber (EPM is a copolymer of ethylene and propylene whereas EPDM rubber is a terpolymer of ethylene, propylene and a diene-component). Since it began to be produced in the 1960s, production has increased to 870 metric tons per annum, mostly due to advances in polymerization and catalyst technologies which allow polymers to be designed for specific purposes.