PU (polyurethane) English name: Polyurethane, referred to as the PU. Chinese name of the polyurethane, commonly known as Urethane, spring rubber, full name: poly urethane or isocyanate polymers. Polyurethane is a cross between plastic and rubber between the elastomer, its unique combination of excellent performance is ordinary plastic and rubber are not available. Features: Polyurethane elastomers with abrasion resistance, chemical corrosion, tensile strength, high flexibility, high pressure load, wear, high strength, shock absorption and strong, tear resistant, radiation resistant, high strength, high load and vibration buffer, good performance. Also has a wide range of hardness from Shore A10-100. More than Shaw A100 and above products. For superior shock absorption, shock absorption cushioning pad, impact-resistant than metal springs, not to hurt the mold. Application: used in metallurgy, mining, petroleum, automobiles, building materials, sports, heavy machinery, large stamping equipment damping plate, pads, springs, and to do all kinds of metal plate, tube red wood mold. General Machinery of friction, or damping effect from the buffer, is ideal for die springs.