Cartridge Heaters

Cartridge heaters can be considered “component heaters” that are used to generate heat in many different applications. These process heaters are primarily used in mold and fit snug inside a cavity and helps heat solids by reaching high temperatures. Cartridge heaters have the versatility of being able to carry thermocouple inside to help control temperatures of the heater more accurately.  Various diameters allow for it to be used in any cavity and can be custom designed with any cold section. Lead wires extend from the end to your control panels. Cartridge heaters are used as a water heater element and in a wide variety of applications. Some of these uses include bag sealing applications, hydraulic oil applications, motor oil applications, gearboxes, water heating applications as well as laboratory and food equipment. Sheaths can reach extreme temperatures as cartridge heaters can be designed with higher watt densities. High watt density cartridge heaters can also have different types of lead wire connections. For more mechanical processes, stainless steel braided leads are used against mechanical stress. BX cabling can be used for added protection, though it reduces the lead wire flexibility. Terminal pins are also available on all models. Cartridge heaters from Wattco are made of a swaged construction that consists in a high-grade nickel chromium resistance wire wound around a high-quality MgO core that is centered in a stainless steel casing.

Cartridge heaters are used for heating metal parts and can also be fitted with threaded bushings for liquid heating for certain applications. Cartridge heaters will reach metal temperatures of up to 1,400ºF (760ºC) with the appropriate material, watt density, and fit selections (see Figure 2 on our catalog page 7.2).

Get a quote on a cartridge heater today. WATTCO also manufactures other industrial heating products such as infrared heaters, immersion heaters, pipe heaters and more. Click here to view all of our products.


  • Built-in thermocouples

    One optional feature on WATTCO cartridges is built-in thermocouples. These could be type “J” or “K”, grounded or ungrounded, and attached either at the disc end or the middle of the cartridge.

  • Graphite coating

    To facilitate their installation and removal, cartridges could be coated with a graphite-like
    substance. This solid lubricant doesn’t increase the outside diameter, and is suitable for temperatures
    up to 750° F

  • Moisture and contamination proofing

    To protect cartridge heaters against moisture and contamination, Teflon lead wires are
    used and the lead end is sealed using Epoxy, RTV silicone or Teflon. The temperature limitation
    is 480° F

  • Distributed wattage

    In applications such as sealing bars or rubber molds, the two ends of a cartridge heater are usually colder than the middle. To overcome this inconsistency and have a uniformly distributed heat source, cartridges could be made to have higher wattages at the ends. 35/30/35 is a common wattage distribution.

  • Center-less grinding

    In applications where superior heat transfer is required, the tolerance on the outside diameter could be improved to +/-0.001″ by center-less grinding.

  • Zones and cold sections

    WATTCO can also manufacture cartridges with cold sections and separate zones that can be controlled independently.

Specification Description
Resistance wire High grade nickel chromium resistance wire
Core MgO core
Casing Stainless steel
Leads Stranded leads with silicone impregnated mica glass insulation

 

Application Sheath Material
Molds, Metal dies, Patens, hot plates, sealing tools, fluid heating, aeorospace, semiconductor industry Stainless steel, incoloy
Food service and medical equipment, Deionized water Stainless steel
General applications incoloy
Highly corrosive applications Titanium

 

KEY FEATURES BENEFITS
  • Main components:
    • High-grade nickel chromium resistance wire,
    • MgO core,
    • Stainless steel tubing,
    • Stranded leads with silicon-impregnated mica glass insulation, or swaged in
    • Special sizes, wattages, and materials are available upon request; 
    • Custom-designed to meet your specifications.
    • Pin leads are available
  • Easy and economical to install
  • Designed with first-class materials 
  • Maximized heat transfer
  • Easy to maintain
  • Uniform temperatures
  • Oxidation and corrosion resistant

 

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