... of glass by high-strength airtight complex gluing. In between is aluminum alloy frame with drier, and ... of gas can be used alone, or mixed in certain proportion. Sound insulation: Hollow glass filled with ... of moisture-prevention: Under environment of large difference in temperature in winter, hollow glass is dew-free. Usage: ... of glass slice: 3mm-12mm Aluminum Pipe in store : 6A , 9A , 12A , 14A , 16A