Physical character: Made by drum-type vulcanizing press(ROTOCURE) or vulcanizing press with high quality Ethylene-Propylene-Diene Monomer Rubber(EPDM, one of synthetic rubber). 1-6mm thickness is made by drum-type vulcanizing press(ROTOCURE) with shiny surface, 7-80mm thickness is made by vulcanizing press for get higher thick thickness. With middling hardness and high tensile strength, excellent performance of aging resistance, acid and alkali resistant, high temperature resistant, low temperature resistant, ozone-resistant, working in the liquid which contains 50% acid or alkali at the temperature of -40° C - +130° C(maximum 150° C momentary). Apply to punch all kinds of seals, gaskets or other shapes and cover on the mechanical equipments.