Because the material itself belongs to acid and alkali resistance is better, and so it can be used in the chemical field, for some special materials, if there is such a gasket = the existence of such gaskets, not only can make its sealing performance good, but also because of the existence of this material, the test questions are often corroded, at the same time, because it can be resistant to aging, because it is determined by the material itself. Therefore, the life span is longer in the process of use. At the same time, it can still use this kind of gasket, whether it is high temperature or low temperature.