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Resistances designed to heat by conduction in molds or solid bodies, it is possible to transmit heat rapidly by conduction if there is physical contact between the heat producer (the resistance) and the heat receiver (any gas or fluid body).

When heating occurs, the molecules expand and move more quickly, producing a transport of heat to the colder body until their temperatures are leveled.

The 321 stainless steel casing presents the best qualities for the manufacture of cartridge resistors.
The materials that can be used in the manufacture are limited by having to have a good deformability, produced by the constant expansions when cooling and heating the resistance, the absence of scales produced by oxidation. And a good abrasive behavior, has shown that it is the optimal material for the construction of resistances.

Cartridge-type resistance made of Aisi-321 stainless steel with an interior compacted with magnesium powder and 80/20 ni-cr wire for use in perforated molds following the H7 standard, because if the mold is not in total contact with the entire resistance , there would be a transmission of heat by convection, for which the air molecules would not transmit the necessary energy to heat the mold, the heat would not dissipate and would remain in the resistance, producing an overheating of the same that would cause a decrease in rigidity. dielectric between the heating wire, the power conductors and the metallic protection, producing a short circuit.

For this reason it is very important to fit the cartridge with the mass to be heated.