Constant temperature heating plate, stable temperature: 50~260C. 1) Aluminum shell. PTC heater is very appropriate under 260 temperature. ... ceramic paint, aluminum plate oxygenated, aluminum plate coated with teflon, aluminum plate electroplated, ceramic plate polished, ceramic plate glaze coated. ... tiancheng-ptc.com. 1) After switching on, the heating power is large, and then decrease, finally it ...