... and breakage caused by hail. polycarbonate hollow sheet/UV sun panel/PC sheetFeatures:1) Light transmission: up to ... 6,000mm/12000mm (our regular specification)3) available in 4mm,5mm,6mm,7.5mm,8mm,10mm,12mm,14mm ... twin-wall and triple-wall about 12mm,14mm,16mm,18mm4) Color: clear, lake blue, green, blue, opal, bronze, ... heat insulation for expressways polycarbonate hollow sheet/UV sun panel/PC sheet