The Sheathed Heater (also called MgO-insulated tubular heater) is the most versatile and widely-used form of industrial electric heating element. Consisting of a resistance wire coil embedded in high-density magnesium oxide insulation within a metal sheath tube, it offers excellent dielectric strength, mechanical durability, and corrosion resistance. By selecting appropriate sheath materials (copper, steel, stainless steel, Inconel, titanium), these heaters can be adapted to virtually any medium — air, water, oil, acid, alkali, or molten salt. Found in nearly every industry from home appliances to aerospace ground support equipment.

Typical Specifications: Power: 50W–15kW per element; Tube OD: Ø3mm–Ø25mm; Length: 20mm–6000mm; Shape: Straight/U-shaped/M-shaped/Custom bent; Sheath material: Copper/SS304/SS316/SS321/Incoloy 800/Inconel 600/Titanium; Max temp: up to 950°C (material dependent).