Ethylene propylene rubber (EPR) is a kind of binary ethylene-propylene rubber (EPM) and tertiary ethylene-propylene rubber (EPDM), is a saturated rubber formed by copolymerization of ethylene, propylene, and a small number of diene monomers, due to its excellent electrical insulation, good resistance to ozone, humidity, heat, cold and ageing properties, has been widely used in low and medium voltage, high voltage and even ultra-high-voltage cables.