Form. The longitudinal direction of the polypropylene is smooth and the cross section is round.
Density. The biggest advantage of polypropylene is its light texture. Its density is only 0.91g/cm3, which is the lightest of the common chemical fibers. Therefore, the same weight of polypropylene can obtain higher coverage than other fibers.
Strong stretchability. Polypropylene has high strength, large elongation, high initial modulus and excellent elasticity. Therefore, polypropylene has good wear resistance. In addition, the wet strength of polypropylene is basically equal to dry strength, so it is an ideal material for making fishing nets and cables.
Hygroscopicity and dyeability. Light weight and good thermal insulation; polypropylene has little hygroscopicity and almost no moisture absorption. The general moisture regain rate under atmospheric conditions is close to zero. However, it has a wicking action that transfers water vapor through the capillary in the fabric, but does not itself absorb any absorption. The dyeability of polypropylene is poor, and the chromatogram is not complete, but the method of coloring the original liquid can be used to make up for the deficiency.
Acid and alkali resistance. Polypropylene has good chemical resistance. In addition to concentrated nitric acid and concentrated caustic soda, polypropylene has good resistance to acid and alkali, so it is suitable for use as filter materials and packaging materials.
Light resistance. Polypropylene has poor light resistance, poor thermal stability, easy aging, and is not resistant to ironing. However, it is possible to improve the anti-aging property by adding an anti-aging agent at the time of spinning.
High strength. The strength of polypropylene elastic yarn is second only to nylon, but the price is only 1/3 of nylon; the fabric is stable in size, good in abrasion resistance and chemical stability. However, it has poor thermal stability, is not resistant to the sun, and is prone to aging and brittleness. For this reason, an anti-aging agent is often added to the polypropylene.
