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Welwyn Tool Group

The approved UK sales & service centre

The approved UK sales & service centre for Leister

Leister TRIAC ST 120V for Roof Membrane

141.308/L0 RM

The TRIAC ST 120v sets the standard for roof welding of single ply, with in-built blower and stepless temperature control to 700 degrees.

Estimated Delivery: Next Working Day (order before 3pm)
£380.65 £317.21


The Professional's Choice for Welding Roof Membrane.

The LEISTER TRIAC ST is the successor to the industry's leading TRIAC S and continues to set the standard for welding and joining various types of roof membrane using a hot air hand gun. The latest version of the TRIAC introduces some excellent new features which will make using the tool even easier. It's easy to clean filters and newly introduced ergonomic grip handle make using the tool a pleasure. The TRIAC ST completes the latest upgrades to the range of roof membrane welding tools still manufactured to this day in Switzerland, guaranteeing the Swiss quality professional roofers have been used to expecting. The TRIAC ST looks to continue the unique Swiss performance and ensures high quality results every time. The TRIAC ST comes as a gun in its case or is available as a complete roof membrane welding kit with the wide range of LEISTER nozzles, rollers and accessories used in roofing.

Key Features

  • Suitable for site work
  • Manual temperature adjustment
  • Sturdy but weighing less than 1 kg
  • Two-component handle grip with optimal centre of gravity
  • Quick clean air filters
  • Automatic carbon stop and heating element protection
  • 120V
  • Takes push fit nozzles

Part No:

    141.308 RM (TRIAC ST 120V Hand Gun for Roof Membrane)


Used in multiple applications the Leister TRIAC ST will not only enable you to weld plastic of all types such as HDPE, PP, ABS, PVC but enables welding of single ply roof membrane, plastic welding of PVC coated fabrics, vehicle plastic bumper repairs, geotextile material welding, heat shrinking and many more applications where hot air tools are required for joining plastic. The Leister TRIAC ST is the hot air tool of choice for professionals worldwide and will be available either as a roof membrane welding kit or as a standalone unit.

Technical data

Voltage : V~ 120

Power W: 1600

Temperature °C: 40 - 700

Size (L × Dia) mm: 338 × 90, handle (Dia) 56

Weight kg: 1.0 (without power cord)

Part Nos: 141.308 RM (TRIAC ST 120V Hand Gun for Roof Membrane Welding)


Standard Next Working Day Delivery

£4.50 +VAT for items up to and including £100 (ex VAT)

£7.50 +VAT for items over £100 (ex VAT)

Next working day applies to orders placed online before 3pm.

LEISTER Machines and Extruders

In order to tailor the correct machine to the correct job, for all LEISTER machines and extruders, we would recommend contacting our experts either online or via +44 (0)1707 331111 to discuss your needs and to place your order.  For information these items are generally available as a next day delivery, if ordered before 3pm, with delivery charged at £11.95 +VAT

Delivery Exceptions and Exclusions

Unfortunately there are a few areas where next working day delivery isn't possible because of their remote location. However we always try to delivery to these areas within 2 working days. In certain circumstances items can sometimes take more than 7 days due to limited courier availability and weather conditions in these areas.

The restricted postcodes are as follows:

 ZE, HS, KW, IV, AB, PH, DD, PA, BT, IM, GY, JE, PO (Isle of Wight).

Where restricted postcodes are on the Mainland delivery will be:

£4.50 +VAT for items up to and including £100 (ex VAT)

£7.50 +VAT for items over £100 (ex VAT)

A minimum of two working days applies to orders with Mainland restricted postcodes placed online before 3pm.

For restricted postcodes that are not on the Mainland delivery will be:

£14.50 +VAT for all items

For these items a minimum of two working days applies to orders placed online before 3pm.

Accessories and Spares
  1. Brass Brush 100mm H133
    Brass Brush 100mm H133
    £10.92 £9.10
  2. Roofing Scissors 157.544
    Roofing Scissors 157.544
    £27.96 £23.30
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