PP is mainly used in the production of various long and short polypropylene fibers for the production of polypropylene woven bags, packing bags, injection molding products, etc. It is used in the production of electrical appliances, telecommunications, lighting, lighting equipment and fire retardant parts for televisions. PP does not have the problem of environmental stress cracking. Usually, PP is modified by adding glass fibers, metal additives or thermoplastic rubber.