corrugated pvc roofing sheet 1,anti-impact 2,heat-insulation 3,anti-corrosion 4,self-cleaning Floworld series corrugated pvc roofing sheet1 ... UPVC tri-ply heat insulation tile is made from overseas PVC colophony with UV ultraviolet absorbent, antioxidant and modifier, which ... and bending strength, impact proof. The physical properties of PVC colophony has been modified by adding various kinds of ...