Cordierite ceramic's host-crystal is 2MgO.2Al2O3.5SiO2, thermal-expansion coefficient low, thermostability good. Cordierite ceramic is used in manufacturing the heater ledger wall, thermocouple insulation porcelain, kiln stove kiln furniture etc, to request thermal shock resistance highly, may also serve as the coil skeleton, the electric insulation material to bear the electric arc function, the compound materials parent metal, the burner nozzle of the electric heating insulated gear and so on.