Pp yarn, also known as polypropylene, is mainly used in various webbings such as webbing and rope mobile straps, shoelaces and backpacks.

The main physical and chemical properties of pp yarn

1. Morphology The vertical surface of polypropylene is flat and smooth with a circular section.

2. Density The biggest advantage of polypropylene is its light texture. Its density is only 0.91g/cm3. It is the lightest density among common chemical fibers, so polypropylene with the same weight can get higher coverage than other fibers.

3. Strong stretch Polypropylene has high strength, large elongation, high initial modulus, and excellent elasticity. Therefore, polypropylene wear resistance is good. 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.

4. Hygroscopicity and dyeability Polypropylene's hygroscopicity is very small, almost no hygroscopicity, and the moisture regain is close to zero under normal atmospheric conditions. However, it has a wicking effect and can transmit water vapor through the capillary in the fabric, but does not exert any absorption by itself. Polypropylene has poor dyeability and incomplete chromatograms, but it can be used to make up for deficiencies.

5. Acid and Alkali Resistance Polypropylene has good chemical resistance. In addition to concentrated nitric acid and strong caustic soda, polypropylene has good acid and alkali resistance, so it is suitable for use as a filter material and packaging material.

6. Lightfastness, etc. Polypropylene has poor light resistance, poor thermal stability, aging, and resistance to ironing. However, anti-aging properties can be improved by adding anti-aging agents during spinning. In addition, polypropylene has good electrical insulation, but static electricity is easily generated during processing.

The application of pp yarn is very extensive. Various webbings and ropes facilitate our daily life.