... 3.sound insulation 4.easy installation 5.uv-protection Hollow polycarbonate sheet:1. Max width :2100mm2. Length:no limited ... 6. Colors: opal ,clear,blue,bronze, green . Hollow polycarbonate sheet applications:Roofing light sheet and sunshade for office building ... Airplanes trains,ships ,vehicles, motor boats.Features of hollow polycarbonate sheet:Light transmission:the light transmission reaches 12%-82% ...