MI - Mineral Insulated Strip Heaters

The MI strip heater is a thin, responsive heater that uses the most advanced heater construction techniques. A nickel-chromium element wire is embedded in Watlow’s exclusive mineral insulation material, which has a much higher thermal conductivity than the mica and hard ceramic insulators used in conventional heaters. This thin layer of insulation brings the element wire closer to the heater sheath. The result is heat flows easily from the element wire to the sheath allowing the wire to run cooler than conventional heaters and increasing heater life.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
304 stainless steel  1400 760 140 21.7
  • Sheath temperatures to 1400°F (760°C)
  • Watt densities to 140 W/in² (21.7 W/cm²)
  • Maximum voltage 480VAC
  • UL® component recognition for most 240VAC or less designs (UL® File #E52951)