Filters are widely used in petrochemical industry, such as hydrogen peroxide, resin, lubricating oil, polymer, viscose, aviation kerosene, various oil products, catalysts, chemical fiber manufacturing process, purification of various fluids, separation and recovery of chemical intermediates and chemical products, and particle removal filtration of lubricating oil, chemicals, oils, thermal solvents, phosphate coatings, etc. Filters not only play an important role in safety, but also can recycle precious chemical materials, intercept harmful substances in environmental protection and reduce pollutant emissions.