... ,hand/foot warmer,massager,physical therapy heater. 1) Aluminum shell. PTC heater is very appropriate under 260 temperature. ... Main appliances: hair straightener, hair crimper, wax melting heater, humidifier, water boiler, liquid warmer, coffee warmer, polymer ... or more PTC connection. Current products with ceramic shell.Part numberLength /mmWidth /mmThickness /mmSurface temperature/High Pot / ...