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.
