... 2.good wear resistance 3.High precision, high concentricity 4.No bubbles 5.Smooth surface 1. What is polyurethane?Polyurethane (commonly ... abbreviated PU) is a unique material that offers the elasticity of rubber ... machined parts, Gaskets, Seals, Rollers, Roller covers, Sandblast curtains, diaphragms. PU paper wheel