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Leister TRIAC ST Hot Air Plastic Welding Kit

100% Swiss made quality.

The new TRIAC ST from Leister is the perfect set for the ambitious plastic fabrication specialist. Characterised by its easy operation, reliability and versatility.

The TRIAC ST is the seventh generation tool in the revolutionary TRAIC hot air tool range from Leister. Decades of experience and Swiss thoroughness is packed into the modern design. Weighing less than 1Kg the TRIAC ST is a real lightweight.
The cooled protective tube always keeps the head cool for greater work safety. Push-fit exchangeable nozzle change.
Air filters on both sizes can easily be removed and cleaned. This ensures optimum air flow and maximum power output.

Suitable for:
Plastic Welding Applications:
  • Overlap welding
  • Draw welding
  • Stitching
Heat Applications:
  • Heat forming
  • Activating
  • Drying
  • Removing Paint, varnish and glue
  • Shrinking

Complete kit includes:
  • TRIAC ST Hot Air Plastic Welding Hand Tool
  • 5mm Speed Weld Push-fit Nozzle
  • Tacking Nozzle
  • Tubular Push Fit Nozzle 32mm
  • Sturdy Tool Box

Technical Specifications for TRIACST:
Voltage 230V
Power Consumption 1600 W
Temperature 40 - 700°C
Air Flow (20°C max) l/min 240
Weight Kg <1 without cord

How To Weld Rigid Plastics:

Which materials can be welded?
Only Thermoplastics can be welded. You must weld like for like plastic to achieve a structurally sound bond.

  1. Prepare the weld surface. Ensure it is clean of dust and dirt so that you can achieve an unobstructed plastic-to-plastic bond. Notch out a “V” groove along the crack or join.
  2. “Tacking” the join or crack together helps to secure the material in place to ensure there is stability and no misalignment of the joins. Run the tip of a tacking nozzle or heated metal item along the join to create an initial bond.
  3. Using a speed welding nozzle or by free hand pendulum welding technique, introduce the plastic weld rod to the weld zone. Ensure equal levels of hot air are directed at the plastic weld rod and the weld surface to ensure they reach “plasticity” at the same time.
  4. When the surface plastic shows signs of slight wetting, move the welding nozzle along the groove while at the same time applying downward pressure on the weld rod to ensure a sound bond.

The below video demonstrates using a Leister Plastic Welder:

Information sourced from
Downloads for TRIACST:
TRIACST Brochure
Product Brochure

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09 525 1000
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