a cartridge heater may be divided in 7 main parts:
* Heating coil
* Insulation
* Sheath
* Sealing
* Termination
* Lead wire type
* Watt density

Heating coil

The heating coil is the actual resistance which is where the electrical load occurs. The most common type of metal alloy used for this purpose is a nickel-chromium mixture, also known as nichrome. The nichrome wire is wound around a ceramic core, and the number of spirals per inch vary according to the requested

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