KXT-150 Flange insolating gasket for high pressure utilizes a stainless steel core boned with high strength insulating laminate G10 or G11, which not only maintains the high strength of stainless steel, but also reaches an excellent insulation. It consists of a spring-energized Teflon seal which provides high confidence sealing and eliminates costly leaks. And the seal groove is cut into the stainless steel core, which can avoid leakage through the interval of two materials.