EPDM is a synthetic rubber. It has general rubber properties, whether proofness, cold resistance, heatresistance, good stretching ability, so widely used for automobile, construction, engineering work, electric discharge, sound insulation, water proofness and heat insulation material. Neoprene is suitable for flexible (expansion and constraction) and fire retardant product. It is used forcushioning, sealing, industries, electronic parts shoes, machinery (packing material) and other specialmaterial.