... perfact mechanical andoptical properties after exposed to extreme weather for a long time.6, Sound Insulation The hollow from ... ,hotel,stadium,school ,amusement center ,hospital,etc.2. skylight,lighting for corridors ,balcony,passages and subway entries ,walkways.3. Advertising ... /sheet.8. Telephone booths ,street name plates.Notes for polycarbonate sheet 1.Never contact the surface with undried ...