Choosing the right welding tool In today’ s roofing market there are many different plastic sheets: PVC-P , ECB, EVA, TPO and other materials that require different welding techniques and experience. Naturally, this makes it more difficult for roofers to choose the right welding tool. In most cases, an automatic welding machine with a 40 mm nozzle is being used for overlap welding. TPO aging effects Although a 40 mm standard nozzle is widely acc

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