Round Profile Coil Heaters


National Plastic Heater continues to support round coil heaters, that revolutionized the injection molding industry in 1980, for nozzle heating applications. The compaction and flexibility of the round coil heaters are core attributes of this time proven technology. Emerging applications of the round coil heater include pressed in brass for nozzle heating and form in place for plate heating and three dimensional heating.

NPH round coil heaters are available in 3.0mm, 3.18mm, 3.2mm, and 4.0mm diameter sizes.

For coil heaters directly on the nozzle or with an outer diameter sheath National Plastic Heater recommends next generation flat coil heater technology.


National Plastic Heaters, Benefits and Advantages:

  • Also used as a form in place heater
  • Offers higher watt density than cable heaters
  • Flexible Cold section
  • Standard Lead Time 7 business days (Shorter lead times possible)



Technical Specifications:

  • Technical DataProfile: 3.0mm(.118”) Round
  • Profile: 3.18mm(.125”) Round
  • Profile: 3.2mm(.126”) Round
  • Profile: 4.0mm(.157”) Round
  • Thermocouple: Integrated type J or type K
  • Maximum Sheath Temperature: 1382 deg. F
  • Sheath Material: Cr-Ni Steel
  • Maximum Total Straight Length: 3000mm (118.11”)
  • Length Tolerance: Heated +/-2.5%; Unheated +/- 5%
  • Maximum Voltage: 250VAC
  • High Voltage Stability: 800 VAC
  • Wattage Tolerance: +/-10% (contact hotset for special)
  • Minimum Bending Radius: 6.35mm(.250”)
  • Watt Density: 38.7 Watts/In2
  • Insulation Resistance: >=5M Ohm @ 500 VDC (cold)
  • Leakage Current: <= 0.1mA @ 253 VAC (cold)
  • Length of Unheated Zone: 65mm(2.56”); 25mm(1.00”) Transition Head






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