Polypropylene (PP) is a kind of thermoplastic synthetic resin with excellent properties. Main uses ： 1. The packaging industry is widely used to manufacture food packaging containers, such as food preservative films and food storage boxes. Because of its non-toxicity and good chemical stability, it can ensure food safety. 2. The automobile industry is used to manufacture automobile interior parts, such as instrument panels and door trim panels, because of its light weight, high strength and easy molding. Some external parts of automobiles, such as bumpers, will also use polypropylene, which can reduce the weight of automobiles and improve fuel economy. 3. Household products make all kinds of household plastic products, such as plastic chairs and plastic pots, because of their low cost and good durability. Household fiber products, such as carpets and curtains, also use polypropylene, which has good wear resistance and stain resistance. 4. Medical field