Round Swaged Cartridge Heaters

1 Heliarc welded end seal.
2 Series 300 stainless steel sheath of precision dimensions and
tolerances for intimate, stable, non-oxidizing contact with
cavities machined for them.
3 Pure magnesium oxide compressed to an optimum density for
best heat transfer and electrical insulation at elevated
4 Element wire situated in close proximity to outside surface for
maximum heat transfer and minimum internal temperature
while preserving good dielectric qualities.
5 Ceramic cap.
6 Fiberglass insulated leads.

Dies, Heat Sealing, Hot Melt Adhesive, Plastic Molding, Platens,
Shoe Machinery.
• Elements are designed for maximum: Watt density, temperature,
heat transfer and heater life.
• The useful life of a Cartridge heating element is determined by
how quickly the heat generated in the resistance wire can be
disappated to the outside sheath. With low and moderate watt
density elements, such as Hotwatt’s standard line, the conventional
method of inserting helical coils in formed ceramics is an entirely
satisfactory method of construction because the wire temperature
relative to sheath temperature, even though considerably higher,
is still well within safe long-life operating temperatures.
• The Superwatt® cartridge heater accelerates the transfer of heat
from the resistance wire to the sheath. This is accomplished by
relocating the wire so that it is closer to the sheath; and swaging
the outside diameter of the heater, thereby compressing the
magnesium oxide filler so that it becomes an improved conductor
of heat from the wire while maintaining its dielectric properties.
(See diagram this page). By improving the heat transfer rate, it is
possible to manufacture elements of higher densities because the
differential between the wire temperature and the sheath
temperature has been minimized.
• Long, trouble free service.
• Made in U.S.A.