... liquid heating, air heating, heating a surfaceCeramic shellCeramic shell, with wire and ceramic insulationLow cost, small bulk, ... for very small bulk, low powerPlastic shellPlastic shell, with wire and plastic insulationLow cost, small bulk, ... is necessary for two or more PTC connection. Plastic shell heating elementModelsLength/ mmWidth/ mmthickness/ mmApplied voltage/VSurface temperature ...