Tubular heaters consist of a steel tube (Ø 8.5 / 11.5 / 12 / 16 mm) and a coiled resistance wire which is aligned centrally in the tube and embedded in highly compacted magnesium oxide (MgO). This provides a durable and stable positioning of the heating element. Welded-on bolts are used as electrical connection and customizable unheated zone.
Due to the high compression the electric heaters are characterised by high insulating resistance and excellent thermal conductivity between heating wire and sheath material.
The tube's end is sealed with special sealing compound in order to maintain excellent electrical insulation. Ceramic bushings insulate the connecting bolt from the sheath material.
Depending on the intended purpose the tube can be delivered in copper, stainless steel and special alloys on request. The heating spiral is made of high temperature-resistant material in accordance with DIN 17470.
After a thermal treatment tubular heaters can be bent and shaped for a wide variety of applications.