Tubular electric heating element (referred to as electric heating tube) is a kind of electrical component which can convert electric energy into heat energy. It is a metal tube shell (including stainless steel, copper), along the tube axis to uniform spiral electric heating wire (Ni Cr, Fe Cr alloy) the gap filling compaction with good insulation thermal conductivity magnesia, pipe ends are sealed by silica gel, the metal sheathed heating element can be heated air, and metal mold all kinds of liquids. The common electric heat pipe fin heating tube, Teflon electrothermal tube, quartz heating tube etc.. Because of its low price, easy to use, convenient installation, no pollution, it is widely used in various heating occasions.