Twin-wall hollow polycarbonate sheet 1) Thickness: 4mm.4.5mm,5mm,6mm,8mm,10mm, ... : 2100 x 6000mm TRIPLE layer hollow pc sheetTwin-wall hollow polycarbonate sheet(4.28 0651) Thickness: 4mm.4.5mm,5mm,6mm ... , shopping arcades, large stadium and raintents, green-house, swimming covering, roof light or canopy for office buildings, departmentstore, hotels, schools, amusement ...