Plastic industry parts are light in weight and can save energy, so their products are becoming lighter and lighter. Non rusting and non corrosive plastics are generally resistant to the corrosion of various chemicals and will not rust or be corroded as easily as metals. It is not necessary to bear the erosion of acid, alkali, salt, oil, medicine, dampness and mould. It is not easy to transfer heat and has good thermal insulation performance. Due to its large specific heat and small thermal conductivity, it is not easy to transfer heat, so it has good thermal insulation effect.