The upper layers is ASA Resin material, which is anti-UV protect roof sheet against the sunshine damage. The second and fourth layers are UPVC roofing material, which is anti-corrosion, heat and sound insulation. The third layer is glass fiber mesh, it likes a bone of the roof sheet, enhanced strength and prolonged service life, can help hold the shape even the temperature is hot and the distance of the truss is large.
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