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Polypropylene injection molding air filter, also known as melt blown filter element, is a filter material made of non-toxic and tasteless polypropylene by heating, melting, spraying, stretching and receiving. The polypropylene filter element has a deep filtering structure with uniform pore diameter, sparse outside and dense inside, and has high filtering efficiency, acid and alkali resistance and other excellent characteristics. It can effectively remove suspended solids, particles, rust and other impurities in the liquid