1. The density of polypropylene fiber is only 0.91 g/m3 (that of polyester fiber is 1.38 g/m3), so polypropylene geotextile has larger coverage area under the same strength when using as polyester geotextile.
2. The special structure of polypropylene fiber makes it have excellent acid and alkali resistance, especially its alkali resistance is better than that of polyester fiber, and its effect is better than that of polyester fiber when it is in the reinforcement, waterproof, anti-seepage applications in underground engineering works with strong acid and alkali environment.
3. Due to the small surface friction coefficient of polypropylene fiber, the friction between fibers is small, the wear resistance is good, and the anti-vibration friction performance is far better than that of polyester fiber.
4. Polypropylene fiber has good hydrophobicity and does not absorb water, so it is better than polyester fiber for water supply and drainage engineering.
5. Compared with polyester geotextile with the same weight, high-performance polypropylene non-woven geo-
textile has more fibers and higher strength, and its longitudinal and transverse strengths are almost the same.