Polycarbonate is a polymer with a unique blend of desirable properties. This polymer can be given shape by different processes, which include injection molding, blow molding, extrusion -and thermoforming. Polycarbonate roof sheets are manufactured by the process of extrusion. Polycarbonate roof sheets are commonly called transparent steel due to their wonderful impact resistance and glass like clarity. Following are a few salient properties of corrugated roof sheets: