Superior Quantities of acrylonitrile cause a rubber with greater oil resistance. Compounds with lower acrylonitrile information have an improved lower temperature versatility and resilience. Ethylene Propylene Rubber (EPM) is actually a copolymer consisting of ethylene and propylene. The ethylene propylene polymer is chemically inert since it incorporates no double bonds. https://beediadiamond.com/catalog/rubber-points