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Top layer---EPDMEPDM synthetic rubber vulcanization of the further strengthening of the materials of polymer,Website:http://www.huadongtracks.com, the good performance for aging resistance, weather resistance, electrical insulation, corrosion resistance, impact resistance etc.Bottom layer---Natural rubberNatural rubber has excellent properties of high elastic, insulation, waterproof, low specific gravity, after appropriate treatment with alkali, heat, cold, pressure. Full solid be consistent from beginning to end, and has a maximum compression deformation. Its advanced partition design maximiz