... -strength airtight complex gluing. In between is aluminum alloy frame with drier, and air between ... large difference in temperature in winter, hollow glass is dew-free. Usage: Office building, hotel, hospital ... and airport control tower; places where heat preservation is needed. Distance between sheets: 6mm, 9mm, 12mm ... 12mm-50mm Thickness of glass slice: 3mm-12mm Aluminum Pipe in store : 6A , 9A , 12A , ...