The polytetrafluoroethylene filter screen is made of 100% pure PTFE monofilament woven in warp and weft. The mesh size is generally between 15 mesh and 300 mesh, the wire diameter is 0.1mm-0.35mm, and the width is between 1m and 2.7m. Because of its excellent high and low temperature resistance, chemical stability, good electrical insulation, non adhesion, weather resistance, flame retardancy and good self lubrication. It has been widely used in petroleum, petrochemical, chemical, light industry, medicine, metallurgy, aerospace, shipping, automobile, machinery, pressure vessels, towers, environmental protection and other industries, and is used for filtering, screening, catalyst, distillation, evaporation, absorption and other processes to entrain dust particles, droplets and liquid droplets in the gas. The polytetrafluoroethylene filter screen produced now has been widely used in the filter liquid filtration and sewage treatment of anti-corrosion equipment in many large domestic chemical plants, as well as the filtration of ammonia, sulfuric acid and hydrofluoric acid.