... /sqm,10mm-1.7kg/sqm,12mm-2.1kg/sqm,14mm-2.4kg/sqm,16mm-2.7kg/sqm 2)High impact resistance:850J/M 3 ... color different thickness 4)Good heat insulation 5)UV blocking layer : 50μm ,can filter about 99% ultraviolet radiation in sunshine ... ,Window Replacement,Domes,Shelters,Canopies,Sheds,Walkways,Carports,Sunrooms Two Layer Polycarbonate Hollow Sheet