Cordierite material. Used in gas burner, bake out furnace, radiator, BBQ. Save gas more than 22%. Various sizes available Infrared ... resistance. It is mainly used in gas-infrared burners, infrared gas stoves, infrared heaters, gas water heaters , gas burner, oven, BBQ and so on ... , outdoor operation using safely.4. Reduce the harmful gas more than 90%. Infrared ceramic plaque for gas water heater