PP filament series of filter cloths adopt polypropylene as raw material, woven through warp and weft twisting. Based on the physical and chemical characteristics of PP fiber, this series of products are given with acid and alkali resistance, hydrolysis resistance, anti-oxidation, mildew resistance, and adaptive to a 90 centigrade operating temperature. Raw material combinations of different specifications and different composition textures can be selected for products, to form various products of different filtration performances and appearances of fabrics, to adapt to varied requirements of users. This product is mainly applied to chemical fertilizer, building material, sugar making, nonferrous metal smelting, effluent treatment, and other numerous industries for plate type filter press, vacuum suction strainer, band filter, page filter, centrifugal filter, and other components for solid liquid separating equipment.