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When getting your vehicle serviced, you might not be surprised if your mechanic tells you it is time for your air filter replacement—however, you may be confused if they told you that you need two air filter replacements.
(1) PP non-woven fabricIt is also called polypropylene non-woven fabric or spunbonded non-woven fabric. It is characterized by being impermeable and air-permeable above 80g. When the square gram is thin, the main raw material is polypropylene. The shelf life is relatively short when exposed to light
1. Lightweight: Polypropylene resin is used as the main raw material for production. The specific gravity is only 0.9, which is only three-fifths of cotton. It is fluffy and feels good.2. Soft: It is composed of fine fibers (2-3D) and is formed by light-point hot-melt bonding. The finished product i