There have been two main directions of technological development in the sealing industry: one is to improve the temperature limit of the sealing material itself. Because the seal sometimes by the temperature limit requirements, extremely cold, super hot impact and pressure on the elastic performance of the seal put forward higher requirements; The other is to extend the service life of seals. The longer the service life, the better the safety and the lower the comprehensive cost.

The elastic recovery energy of different gasket materials at high temperature varies greatly. With the increase of temperature, the compression amount of gasket increases while the elastic energy decreases, the creep intensities, the plastic deformation of gasket increases, and the springback rate decreases, which is the main reason for the leakage of high temperature connection. The gasket will creep under long time stress. The creep of the gasket makes the elastic deformation part disappear, which causes the stress relaxation of each force element in the connecting system, thus leading to the sealing failure of the connecting system. This situation is more serious under high temperature conditions.Expanded ptfe Sheet gasket  solves the sealing requirements for most production conditions