Low watt density cartridges type TI & TL


The low watt density cartridges are designed to heat solids by conduction. They are usually used in press mould heating or thermo-welding machines.

Maximum operating temperature of low watt density cartridge 500°C, maximum load 6W/cm² (35W/Sq. Inch) for TI with stainless steel tube and 350°C, maximum load 4W/cm² (26W/Sq. Inch) for LI with brass tube.

Technical specifications:

  • Resistive alloy wire nickel chromium 80/20 coiled
  • Insulation by ceramic parts
  • Stainless steel tube diameter 9.5 (3/8ʺ), 10, 11, 12, 12.5, 12.7 (1/2ʺ), 13, 14, 15, 15.8 (5/8ʺ), 16, 17, 18, 19.8,20, 23, 25, 25.4 (1ʺ), 28, 30, 32, 38, 40mm.
  • Tolerances on tube diameter ±0.1 mm for stainless steel
  • Length from 40 to 3000 mm
  • Termination by nickel cable glass fibre insulated, length to order
  • Voltage up to 440 V 1 phase
  • Power from 75 to 5000W
  • End plug crimped

Possible variations:

  • Other diameters, square cartridge
  • Sheath in brass
  • Water proof and plug argon welded or silver brazed
  • Built in thermocouple type K or J
  • Welded threaded gland BSP or metric
  • Welded Flange or bracket for fixing
  • Earth connection cable added
  • Special sealing, e.g. high temperature cement, epoxy resin, silicon
  • Connection by high temperature cable, Kapton insulated up to 400°C and ceramic beads up to 800°C


The low watt density cartridge should be assembled in a reamed hole with a clearance of 0.2 mm.

You must use a temperature control device to regulate the temperature of your process.

The layout of cartridges in the part to be heated must be on a regular pitch. The sensor for temperature control must be fitted in the middle.

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