Tetrafluoro-flange gasket is a kind of non-metallic gasket, which is generally composed of two parts: cladding layer and embedded material. The cladding layer is corrosion resistant and is usually made of polytetrafluoroethylene (PTFE) with inserts (fillers) that are more resilient and are usually asbestos rubber sheets. The sealing gasket can be made into V-shape, U-shape and L-shape according to...