The cartridge
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.
