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O-Ring EPDM is a type of ethylene propylene diene monomer rubber, which is formed by copolymerization of ethylene, propylene, and a small amount of non conjugated dienes. It usually has excellent resistance to ozone, sunlight, and weather, can maintain good flexibility at low temperatures, has good chemical resistance to many dilute acids, alkalis, and polar solvents, and has excellent electrical insulation performance.