Since the film of the coated needled felt is made of polytetrafluoroethylene (PTFE), it has excellent chemical resistance and is not found in sulfuric acid, sodium hydroxide, and the strong corrosive agent UF5 in the atomic industry. Corrosion, heat and cold resistance, long-term use at -200-250°C, good electrical insulation and smooth surface, small pore size, good filtration performance, no hydrophilicity, compounding The cloth filter surface plays a role of surface filtration. Kib is mainly used as a support material to maintain the required mechanical strength during use, and its material can be selected according to the requirements of the site. Thin film is an ideal filter material, pore size is generally between 0.5-3um, the minimum pore size can be 0.02um, because it consists of many very small fibers, the pore size between the fibers is um grade, the porosity is very high.
