EPDM (Ethylene Propylene Diene Monomer Rubber)[1][2][3] is a widely used synthetic rubber. The dienes used to make EPDM rubber are ethylidene norbornene (ENB), dicyclopentadiene (DCPD) and vinyl norbornene (VNB). Typically 4-8% of these monomers are used. [4]EPDM is a Class M rubber according to AST