heating element,ceramic heater element element,quartz heating tube factory price certification :UL,TUV sell to ... -standard size product. 2)The structure of tubular electric heating element is in a metal tube into the heating wire, and ... ,Φ14,Φ12,Φ10,Φ8.5,Φ8,Φ6.5 Length:200mm5000mm Surface treatment: a variety of plated nickel, passivation, black, spray. Electric ...