The tubular heater is a high-quality
seamless metal tube, with
electrothermal alloy wire (nichrome
wire, ferrochrome wire) evenly twined
around the the central axis in the
tube. The gap in it is compactly
filled with oxydic magnesia with fine
insulativity and thermal
conductivity, and the nozzle is
sealed with silica gel or ceramics.
This kind of metal armored
electrothermal element has the
function of heating gases, molds and
a variety of liquids.
