Pp filter element (also known as melt-blown filter element) is a kind of filter material made of nonpoisonous and tasteless polypropylene by heating, melting, spraying, stretching and receiving. Pp filter element has a deep filtration structure with uniform pore size, sparse outside and dense inside, and has excellent characteristics of high filtration efficiency and acid and alkali resistance. It can effectively remove suspended solids, particles, rust and other impurities in liquid. The filter element has no inner shaft and adopts the design of internal sealing and external discharge, which not only can maintain stable flow, pressure difference and service life, but also has excellent deep filtration effect and pollutant accumulation. It is a filter element with high efficiency, low pressure difference, long service life and wide applicability. Because the chemical composition of PP is clean, it meets the food hygiene standards, and it will not cause secondary pollution to the filtered liquid due to the material. It has the characteristics of large flow, high precision, corrosion resistance and high pressure resistance, and is widely used in the pre-filtration treatment of PCB, electroplating, pure water, food and drinking water. Pre-filtration treatment of reverse osmosis, etc.