Ethylene propylene rubber is a kind of rubber with a lower density of 0.87. In addition, a large amount of oil can be filled and fillers can be added, which can reduce the cost of rubber products and make up for the high price of raw rubber of ethylene propylene rubber. In addition, for ethylene propylene rubber with high Mooney value, the physical and mechanical energy after high filling will not be reduced by much.

EPDM is a terpolymer of ethylene, propylene and non conjugated dienes. Dienes have a special structure. Only one of the two bonds can be copolymerized. The unsaturated double bond is mainly used as the cross chain. The other unsaturated polymer will not become the main chain, but only the side chain. The main polymer chain of EPDM is completely saturated. This property makes EPDM resistant to heat, light, oxygen, especially ozone.