Polypropylene fiber is the lightest synthetic fiber, with density 0.90-0.92 g/cm3, it becomes the lightest among all chemical fibers, meanwhile, polypropylene fiber has excellent characteristics as high strength, acid resistance, alkali resistance, anti-microbial, same tenacity under dry and wet conditions, so it’s also the preferred material for the outdoor clothes, filtration materials, fishing nets, ropes, disposable hygiene and medical products, etc.