Polypropylene fiber, near the flame that is melting shrinkage, flammable, off-fire burning slowly and black smoke, yellow flame on the upper end, the lower end of the blue, emitting a petroleum smell, burned ash for the hard round light yellowish-brown particles, easy to break by hand twisting. It is made of propylene as raw material by polymerization, melt spinning fiber.

Currently the market production of polypropylene silk industry raw materials are granules, powder and recycled materials, according to the division of product quality in the order of granules > powder > recycled materials. Because polypropylene has a simple production process, the product is inexpensive, high strength, relative density and other advantages, so the development of polypropylene is very fast. Currently polypropylene has been the fourth largest variety of synthetic fibers, is the lightest fiber in the common chemical fibers.

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