0191 5166636 enquiries@ht-uk.com

The MI band heater from Watlow® is a high-performance heater. The band heater's performance and name are derived from Watlow's exclusive mineral insulation—a material with much higher thermal conductivity than mica and hard ceramic insulators used in conventional heaters.

A thin layer of the “high” thermally conductive MI material is used to electrically insulate the element wire from the inside diameter of the heater sheath. A thicker, “low” thermally conductive layer backs up the element wire directing the heat inward toward the part being heated.

The result is more efficient heat transfer, which lowers element wire temperatures and increases band heater life.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Stainless steel  1400 760 100 15.5
  • Heater operating temperatures to 1400°F (760°C)
  • Watt densities to 100 W/in² (15.5 W/cm²) available on large diameter barrel bands
  • Maximum voltage to 480V


  • Extruders
  • Blown film dies
  • Injection molding machines
  • Other cylinder heating applications

Features & Benefits:

Features Benefits
High thermal conductivity of MI and low mass construction
  • Provides an almost instant response to temperature control
  • Eliminates thermal lag and temperature overshoot associated with ceramic insulated heaters
Operating temperatures up to 1400°F (760°C)
  • Allows safe melting of resins such as PEEK™, Teflon®, Ultem® and Zytel®
Higher watt densities
  • Contributes to faster heat-up and throughput for increased productivity
Stainless steel cover and side fold design
  • Resists contamination from overflow of plastic or other free-flowing materials
Attached clamp bars
  • Eliminates cumbersome clamping straps, making installation easier