Mica Strip Heaters - Construction Overview

Construction and Features

Mica insulated strip heaters utilize the finest quality muscovite and phlogobite mica, different high-grade alloys of resistance wire, and stainless steel sheathes. The proper components are selected and the heater is designed according to the requirements of each application.

One critical issue with flat heaters is that they tend to detach from the surface they are mounted on due to thermal expansion. To prevent this, an adequate number of mounting screws should be used at the ends as well as the middle of the heater. Incorporated pressure plates could be used to give rigidity to the top sheet, improve heat transfer, and maintain a uniform heat distribution.

The maximum allowable watt density with respect to the application temperature is shown in the diagram. However, 20 watts/in2 is a standard safe value. Mica insulated strip heaters are available in different termination styles, and could accommodate holes and cut-outs.

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