Polypropylene Polypropylene is the trade name of polypropylene fiber. It is a fiber made from propylene as a raw material through polymerization and melt spinning. Polypropylene officially began industrial production in 1957 and is a rising star among synthetic fibers. Because polypropylene fiber has the advantages of simple production process, low product price, high strength, and light relative density, polypropylene fiber has developed rapidly. At present, polypropylene is the fourth largest variety of synthetic fibers. The production of polypropylene fiber includes short fibers, filaments and split film fibers. Polypropylene film fiber is made by first making polypropylene into a film, and then stretching the film to split it into a network of fibrils. Polypropylene is widely used in the manufacture of industrial fabrics and non-woven fabrics. Such as carpets, industrial filter cloths, ropes, fishing nets, building reinforcements, oil-absorbing blankets and decorative cloths. For civilian use, polypropylene can be spun purely or blended with wool, cotton or viscose to make various clothing materials. In addition, polypropylene film fibers can be used as packaging materials.