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http://www.prowangtw.com/pvc-r....oofing/plastic-roofi Plastic Roofing Advantages of PVC foam corrugated sheets: 1. Excellent Electrical Insulation PVC Corrugated Sheet is electrical insulation, even on thunder & lightning weather or wires skin damage situation, the sheets will not be conductive. Particularly in thunderstorm frequently occurring areas, PVC corrugated sheets offer a much safer living environment compare with the metal corrugated sheets. 2. Green Environmentally Friendly Materials PVC corrugated sheets are user-friendly materials. No formaldehyde, plasticizers, asbestos or TVOC. Absolutely recyclable, fit in