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Polyurethane, commonly a new composite material between plastic and rubber, is formed after chemical reaction of polymer polyalcohol and isocyanate through chain extension and cross linkage. It is divided into polyether and polyester according to its backbone chain.
PU is used for shock absorption backing plate, spacer and springof metallurgy, coal mine, petroleum, automobile, building material, sports, heavy machine and large press equipment as well as die of metal plate and tube .