Mica Band Heater

Mica band heaters offer efficient and economical solutions for heating cylindrical surfaces that require indirect external heating. They are ideal solution for high watt density and high temperature applications. It uses nickel chromium resistance strip as heating element which is precisely wounded on a dielectric material for even heat distribution. The heating element is insulated within a mica core enclosed in a metal sheath which provides exceptional insulation, dielectric strength and heat transfer capability for faster heat up and longer heater life. Heaters can incorporate various sized holes and cut-outs and are customizable for various dimensions, wattages, voltages and materials to suit different application requirements. Mica band heaters can also accommodate built in thermocouple which helps in controlling temperature more accurately. Thermocouples can be of type “J” or type “K”, grounded or ungrounded.


Max. Sheath Temperature  450°C
Voltage  120 V & 240V, Single Phase, 2 Phase, 3 Phase
Watt Density Up to 45 W/in2
Minimum Diameter 2”
Minimum width 1”
Regular gap 3/8”
Terminal Enclosure Regular or moisture-resistant terminal box
Control Thermostat or Thermocouple

Note- For custom design requirements please contact sales@marathonheat.com

Download Catalogue


Maximum Allowable Watt Density in Watt/Sq. Inch


CYLINDRICAL TEMP OC 94 150 205 260 315 370 425
1.5-3” I.D. 52 51 50 46 41 37 29
3-10” I.D. 47 46 45 42 38 33 25
20 41 40 39 36 31 27 20



Fiberglass Lead & Stainless Steel Braid terminations:



Marathon Special Constructions:



  • Injection, Extrusion and Molding Processes.
  • Plastic Processing Industry.
  • Chemical Industries.
  • Food Processing Industries.
  • Oil Lubricating Unit.
  • External Tank And Vessel Heating.
  • Blown Film Dies.
  • Various shape options available.
  • Reasonably high temperature.
  • Good efficiency.
  • Good lifetime.
  • Low cost.
  • Less in thickness.