Polytetrafluoroethylene (PTFE) film is manufactured by turning PTFE moulded blank. It has excellent dielectric properties, no aging, the best chemical corrosion resistance and a wide range of application strength. Polytetrafluoroethylene (PTFE) turning film is a kind of directional film formed by calender rolling on hot roll. It has high crystallinity, tight molecular orientation and small void fraction. Therefore, PTFE film has been greatly improved, especially the voltage strength is more obvious. Raw material belt production process and characteristics, also known as sealing belt, discharge stop belt. A banded product without any additives is prepared by paste extrusion and calendering of PTFE disperse resin. White, smooth appearance, uniform texture, excellent heat resistance, corrosion resistance, self-adhesive, good adhesion, good sealing.PTFE Tape is waterproof.