... Safe using and reliablity, is the preferred electrical heating pipe for manufacturer of various electric appliances. 5)Heating pipes ... magnesium oxide tube Material: Stainless steel seamless pipe, welded pipe, copper, yellow brass pipe, carbon steel pipeCommon diameter:Φ22,Φ20,Φ18 ... technical requirements to produce all kinds of electric heating pipe for different materials, models and shapes of the , ...