After  being  treated momentarily under  high temperature ,flake graphite becomes expandable graphite  which can expand 100-400 times in volume and still remains  the performances of natural flake graphite .Being vermicular ,loose and porous  ,its heat-resistant range under the oxygen-isolated environment is from -200°C to 3000°C.  Characterized by good expandability and chemical stability  under conditions of high temperature,high pressure and radiation  ,it is widely  used for  the dynamic  seal and the static seal in  petroleum industry,chemical industry,electric industry,space industry,automobile industry,ship industry and instrument industry .