1. Form The longitudinal surface of polypropylene is straight and smooth, and the cross section is round.

2. Density The biggest advantage of polypropylene fiber is its light texture. Its density is only 0.91g/cm3, which is the lightest variety among common chemical fibers. Therefore, polypropylene fiber of the same weight can obtain a higher coverage area than other fibers.

3. Strength and elongation Polypropylene has high strength, large elongation, high initial modulus and excellent elasticity. Therefore, polypropylene fiber has good abrasion resistance. In addition, the wet strength of polypropylene is basically equal to the dry strength, so it is an ideal material for making fishing nets and cables.

4. Light moisture absorption and dyeing properties, good warmth retention; almost no moisture absorption, but strong absorption capacity, and obvious moisture absorption and perspiration effect; polypropylene fiber has low moisture absorption and almost no moisture absorption, and the moisture regain under general atmospheric conditions is close to zero . But it has a wicking effect and can transfer water vapor through the capillary in the fabric, but it does not have any absorption effect. The dyeability of polypropylene is poor and the chromatogram is incomplete, but the original solution coloring method can be used to make up for the deficiency.

5. Acid and alkali resistance Polypropylene fiber has good chemical resistance. In addition to concentrated nitric acid and concentrated caustic soda, polypropylene fiber has good resistance to acids and alkalis, so it is suitable for use as filter materials and packaging materials.

6. High strength The strength of polypropylene stretch yarn is second only to nylon, but the price is only 1/3 of that of nylon; the fabric made of it has stable dimensions, good wear resistance and good chemical stability. However, it has poor thermal stability, is not resistant to sunlight, and is prone to aging and brittle damage. Therefore, anti-aging agents are often added to polypropylene