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Factory Price 1.2mm 1.5mm 1.8mm 2.0mm Tpo Roofing Waterproof Membrane Material for Metal Steel Roof. Environmentally friendly, chlorine-free, and pollution-free. hot air welding is safe, reliable, and durable. acid and alkali resistant, suitable for high acid and high alkali areas. high shear strength, high tear strength, impact resistance, and puncture resistance.