The filter bags are made of imported polytetrafluoroethylene materials and fully hot-melt welded. They are mainly used in the filtration industry with strong corrosiveness. Tetrafluoroethylene (PTFE) is abbreviated as "Teflon" in English, written as Teflon or PTFE, and is known as the "King of Plastics". Its Chinese products are "Teflon", "Teflon", "Tefulong", "Teflon", etc. It is a polymer compound formed by the polymerization of tetrafluoroethylene and has excellent chemical stability and corrosion resistance.