... hollow polycarbonate sheet 1) Thickness: 4mm.4.5mm,5mm,6mm,8mm,10mm,12mm 2) size: 2100 x 6000mm TRIPLE layer hollow pc ... sheetTwin-wall hollow polycarbonate sheet(4.28 0651) Thickness: 4mm.4.5mm,5mm,6mm,8mm,10mm,12mm2) width and length: 2100 ... subway exits, parking lots, bus-stops, shopping arcades, large stadium and raintents, green-house, swimming covering, roof light or canopy for ...