To what extent can the temperature of PTFE film be reached before it can be used?

PTFE membrane temperature -190~+600 ℃ (oxygen free up to 1000 ℃ under low pressure). Polytetrafluoroethylene has good low-temperature resistance and its yield strength is much higher than room temperature. Therefore, PTFE winding pads can be used for low-temperature media such as liquid hydrocarbons. At the same time, due to the addition of metal strips, the usage temperature of PTFE film can reach 250 ° C, and it can reach 9mpa and 200 ° C in acidic media. PTFE membrane is suitable for heat exchangers, reactors, pipelines, valves, pump inlet and outlet flanges, with significant pressure and temperature fluctuations. For medium pressure, temperatures exceeding 300 ℃ should consider using inner, outer, or inner rings.

In gas media, the pressure is 14.7MPa (up to 19.6MPa in China), while in liquid, it is available at 30MPa. The relationship curve between pressure stress and leakage rate. The metal winding pad cleverly utilizes the heat resistance, elasticity, and strength of metals, as well as the flexibility of non-metallic materials, resulting in good sealing performance. Among them, the stainless steel winding flexible graphite pad has good performance. Its pre tightness is smaller than that of asbestos winding pads, and there is no disadvantage of asbestos fiber hole leakage. The relationship curve between the two is the pre specific pressure and leakage. In oil media, 0Cr13 is mainly used for metal strip materials, while 13cr18Ni9Ti is recommended for other media.