... made by fusing together 2 panes of glass spaced by dry air,argon or other inert gases.Features:Its excellent efficiency ... in solar heat insulation, greatly reduces cooling loads.The dry air inside the enclosure renders the surface free from misting.More ... inert gases.Applications:Architecture, train window, refrigerator, etc.Specification:air space gap:6mm.9mm,12mm,15mm,16mmMax size:2660mm*3300mm ...