Ptfe sealing ring (polytetrafluoroethylene) has high temperature resistance and can work for a long time in extreme high temperature environments. The continuous use temperature range is -200℃ to 260℃, and the short-term use temperature can reach 300℃. Therefore, the PTFE seal can work stably in high temperature environment. However, it should be noted that long-term high temperature use may lead to a decline in the performance of the PTFE seal ring, and even deformation, rupture and other problems. In addition, the high temperature resistance of the PTFE sealing ring will also be affected by other factors, such as pressure, medium speed and so on.