WATLOW 1/8″ FIREROD® Cartridge Heater

A cartridge heater is a tube-shaped, heavy-duty, industrial joule heating element (electrical resistance) used in the process heating industry, usually custom manufactured to a specific watt density, based on its intended application. Highly compacted they reach a surface watt density of up to 50 W/cm².

It may be used to heat any kind of substance or material, such as oil, air, or sugar. However, a common application are plastic pellets, which are melted in order to form molded plastic parts. An example of such a process is the “hot runner” process. Cartridge heaters resemble tubular heaters structurally but tend to have higher watt densities.

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Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Alloy 600 1400 760 400 62
  • Maximum Voltage: 240V
  • Maximum Wattage at 240V: 744 W
  • Maximum Amperage: 3.1 amp
  • Wattage Tolerances: +10 percent, -15 percent
  • Dimensions: Lengths less than 1.0 in. (25.4 mm)
  • Application


  • Burn-in chip test system
  • Mass spectrometry
  • High-definition ink jet printers
  • 3D printing, fused deposition modeling
  • Gas chromatography
  • Respiratory equipment
  • Gas analyzers
  • Freeze protection
  • Packaging
  • Features And Benefits

    Features And Benefits

    Features Benefits
    Nickel chromium resistance wire
  • Ensures even, efficient distribution of heat to the sheath
  • Magnesium oxide insulation of specific grain and purity
  • Results in high dielectric strength and contributes to faster heat-up
  • Alloy 800 sheath
  • Resists oxidation and corrosion from many chemicals, heat and atmospheres
  • Minimal spacing between element wire and sheath
  • Results in lower internal temperature
  • Accommodates a design with fewer or smaller heaters operating at higher watt densities
  • Conductor pins
  • Provides a metallurgical bond to the resistance wire
  • Ensures a trouble-free electrical connection
  • UL® and CSA approved flexible stranded wires
  • Lead insulation rated to temperatures of 480°F (250°C)
  • Patented lead adapter (LA) method
  • Allows same day shipment on more than 150,000 configurations of stock FIREROD heaters and lead combinations
  • International Organization for Standardization (ISO) 9001 certified
  • Provides confidence that quality and reliability expectations are met
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