*Relative density: Polypropylene has the smallest relative density among synthetic fibers, about 0.91g/cm3, so it is extremely light, and the fiber per unit weight can cover a larger area.*Strength: The strength of polypropylene is similar to that of high-strength polyester and nylon in synthetic fibers, but the strength hardly changes in the wet state, which is better than nylon.
*Abrasion resistance and corrosion resistance: The flat wear resistance of polypropylene is second only to nylon, corrosion resistance, and has significant stability to inorganic acids and alkalis
*Electrical insulation and warmth retention: Polypropylene has high electrical resistivity (7*10Ω.cm) and low thermal conductivity. Compared with other chemical fibers, polypropylene has good electrical insulation and warmth retention, but it is prone to static electricity during processing.
*Heat resistance and aging resistance: Polypropylene has a low melting point (165~173 degrees Celsius) and poor stability to light and heat, so polypropylene has poor heat resistance and aging resistance, and is not resistant to ironing. But the anti-aging performance can be improved by adding anti-aging agent during spinning.
*In addition, polypropylene, like other synthetic fibers, is not easy to mold. Rot and moth-eaten.