Sheathed electric heater air heater with heat dissipation fins on sheath surface
Sheathed Electric Heater, often vividly referred to as an "electric heating sandwich," is an industrial heating device that seals resistance heating elements inside a metal sheath. With its robust structure, high thermal efficiency, and safety and reliability, it has become an indispensable basic heating element in industries such as petrochemical, machinery manufacturing, and electric power.
Simply put, it is like an "electric heating sandwich":
Core: Resistance wire (heat source, typically nickel-chromium or iron-chromium-aluminum alloy)
Middle layer: Dense magnesium oxide powder (insulation layer, also efficient in heat conduction)
Outer layer: Metal sheath (protective layer, responsible for heat transfer and contact with the heated medium)
