Thermostat ceramics made of 95% alumina or steatite,are widely used in some electrical equipments duch as drinking fountains, water heaters, refrigerators, air conditioning, and sonelectric refrigeration ventilations. Because of sintered temperature over than 1000℃, its has a stable characteristics on strength, insulation,heat resistance, and sensitivity to temperature. With its low-cost mass production manufacturability, it has replaced the traditional bakelite, plastic products. It is totally accord with ROHS standard without any harmful substances.