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

A thin layer of the “high” thermal conductive MI material is used to electrically insulate the element wire from the inside diameter of the heater sheath. A thicker, “low” thermal conductivity layer backs up the element wire, directing the heat inward toward the heated part. The result is more efficient heat transfer—a performance solution lowering element wire temperatures and increasing heater life.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Stainless steel   1400 760 230 35.6
  • Maximum voltage to 240V
  • Heater operating temperatures to 1400°F (760°C)
  • Watt densities to 230 W/in² (35.6 W/cm²) available on small diameter nozzle nozzles


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

Features & Benefits:

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