... stable and secure 4.temp. self-control 5,long lifetime PTC heater, self-controlling, lower cost, easy to assemble, long ... Liquid substance evaporator can be made of plastic shell or ceramic shell. The holes in the bars must be homogeneous ... would be about 10PTC PTC self-controlled heaterOur company can supply PTC heater with ceramic shell, or PTC heating pellet. PTC heater for mosquito repellent