Leister COMET 500 Automatic Hot-Wedge Welding Machine

The Leister COMET 500 is an automatic hot-wedge welding machine engineered for the overlap welding of thermoplastic geomembranes including HDPE, LDPE, LLDPE, PE, PP, TPO, FPO, and PVC materials across civil, environmental, and industrial containment applications.

Hot-Wedge Welding for Civil and Environmental Containment Projects

Geomembrane welding is among the most technically demanding operations in civil and environmental construction. Weld integrity is not a quality aspiration – it is a contractual, regulatory, and environmental requirement. Whether sealing a landfill cell, lining a water reservoir, or protecting a mine tailings facility, a failed seam is a project liability with consequences that extend well beyond the cost of rework.

In these environments, the welding machine must deliver repeatable seam geometry across variable site conditions – including uneven substrates, sloped terrain, and fluctuating supply voltage. The COMET 500 is designed specifically to meet these demands. Its automatic wedge positioning, adjustable pressure force module, and powerful drive motor combine to produce homogeneous weld seams that hold specification across the full range of geomembrane materials and thicknesses encountered on working sites in Oman and across the GCC.

COMET 500 Features and Technical Capabilities

• Speed up to 8 m/min without gearbox conversion: The COMET 500 reaches welding speeds of up to 8 m/min across compatible materials without requiring mechanical gearbox conversion, reducing setup time and eliminating a common source of operational delay on site.
• Automatic hot-wedge positioning: The wedge is automatically located at the correct point within the overlap, ensuring consistent heat transfer geometry on every run and removing operator-dependent variability from the seam alignment process.
• Force module with adjustment screw: Welding pressure is set via a dedicated force module with a manual adjustment screw, allowing the operator to calibrate pressure to the specific material and application requirements without tool changes or mechanical dismantling.
• High-power reserve for undervoltage conditions: The COMET 500 maintains homogeneous weld seam production even when site power supply drops below nominal voltage – a critical capability for remote and generator-powered project sites common across Oman and the GCC.
• Optimised copper hot wedge geometry: The 60 mm x 50 mm copper wedge is shaped for maximum thermal efficiency during overlap welding, ensuring uniform heat transfer across the full seam width of 2 x 15 mm and reducing energy waste at the weld interface.
• Robust drive motor with high-grip pressure rollers: The drive assembly is engineered to maintain traction and consistent advance speed on uneven and steeply inclined terrain, sustaining weld quality in the variable ground conditions typical of landfill, reservoir, and canal lining operations.
• Digital display with continuous parameter monitoring: Welding speed and temperature are displayed in real time on the integrated digital panel, providing the operator with continuous visibility of process parameters throughout the welding run.
• Interchangeable pressure roller system: A full range of pressure rollers is available for the COMET 500, covering all standard weld seam geometries in steel and silicone, with and without test channel. These rollers are compatible with Leister’s TWINNY T5, TWINNY T7, and the predecessor COMET model.
• Slim profile for geomembranes up to 125 mm overlap: The COMET 500’s compact, slim design is optimised for hot-wedge welding within the 125 mm maximum overlap, with ergonomically positioned handles that facilitate accurate guidance, lifting, and repositioning on site.

Geomembrane Welding Applications in Oman and the GCC

• Landfill and waste containment lining: The COMET 500 welds HDPE and LLDPE geomembrane liner systems used to seal landfill cells and leachate containment structures to required environmental specifications.
• Water reservoir and canal sealing: The machine produces specification-grade seams for PE and TPO membrane systems used in potable water storage, irrigation canals, and water management infrastructure.
• Mine and tailings facility containment: The COMET 500 is suited to welding pond liners and barrier membranes in mining environments where chemical resistance and long-term seam integrity are primary performance criteria.
• Aquaculture pond lining: PP and FPO geomembranes used in fish farm and aquaculture pond construction are welded to containment specification using the COMET 500’s adjustable pressure and temperature parameters.
• Foundation and gas barrier membrane installation: The machine is applicable to the installation of PE and TPO barrier membranes used in building foundation protection and subsurface gas migration control systems.

Leister COMET 500 – Authorised Supply and Technical Support Through iBuild in Oman

iBuild is an authorised Leister distributor operating in the Sultanate of Oman, supplying the full range of Leister plastic welding and process heat equipment to civil contractors, environmental engineers, and geomembrane installation specialists across Oman and the wider GCC region. The COMET 500 is stocked and supported through iBuild’s in-country operations, ensuring local equipment availability without dependency on cross-border supply chains.

Beyond equipment supply, iBuild provides the technical depth that geomembrane welding projects require – including application guidance, genuine Leister consumables and accessories, and lifecycle support throughout the operational life of the machine. For project teams specifying or procuring automatic hot-wedge welding equipment in Oman, iBuild is the authorised technical partner with the manufacturer-backed expertise and local presence to support the work from specification through to completion.