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Hot Air Welders
One of the major advantages of thermoplastic membranes is their heat weldability. One of the characteristics of thermoplastic is that when heated sufficiently, the material temporarily changes from a solid to a semi-solid state enabling the sheets or panels to be fused together and return to a solid upon cooling. Thus, a monolithic (continuous) membrane is created.
Sika Sarnafil is the only membrane manufacturer that designs and produces it own hot-air welding machines. For the most reliable and permanent seam welding, Sika Sarnafil’s authorized applicators use a Sarnamatic hot-air welder.
For smaller, hard to reach areas or for use around details, a hand-held hot-air welder is used.
How hot-air welding works:
Heated air is blown into the seam area, causing the membrane surfaces to melt. A roller and the weight of the machine then presses the two sheets of membrane in the overlap together. As the welder moves away from a given seam location, the membrane quickly cools down to ambient temperature and the heat weld is completed, providing a watertight, permanent bond. In fact, the welded seam is stronger than the surrounding membrane.
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