Polyurethane itself is a high polymer, which has several times better wear resistance and elasticity than nylon. Therefore, polyurethane is widely used, and its main raw materials are only composed of two kinds of chemical substances, which are relatively simple. But it is also relatively variable. First of all, the most important feature of polyurethane is durability, good heat insulation and water resistance. Therefore, it has been widely used in industrial buildings and our lives 。 And like polyurethane wheel and general professional production of some nylon wheel material is not the same.

From the point of view of performance, polymers are usually in solid or gel state because of their large molecular weight and good mechanical strength. Because their molecules are covalently bonded, they have good insulation and corrosion resistance, and have good plasticity and high elasticity. High elasticity is a unique property of polymers. In addition, solubility, melting, solution behavior and crystallization are also very different from those of low molecules.