... heat insulation, recyclable & environment-friendly, energy saving,UV proof, fireproof for roofing system.A vacuum foamed structure of Upvc ... our UPVC surface and layers, so its Acid-proof, alkali-proof in Acid ,alkali or salty environments. Xinli UPVC roof tiles offer ... tiles have excellent pressure resistance and bending strength, impact proof. The physical properties of PVC colophony has been modified ...