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The Facts About IGMA releases vacuum insulating glass technical bulletin Revealed

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The VIG concept provides numerous considerable attractive possibilities: Extremely high levels of thermal insulation can be achieved, in principle; The vacuum area is really thin, so the total thickness of the structure is just a little higher than the combined thickness of the 2 glass sheets; VIG should show minimal degradation in the field due to gas permeation through the hermetic edge seal.

History The principle of VIG was first explained in a 1913 German patent by Zoller only twenty years after the development of the Dewar flask. This patent declares structures with several glass sheets, and internal assistances including "ribs, grooves, prisms, forecasts on the glass sheets, spheres or blocks made of thermally insulating product, and line supports crossing at an angle".

The claims in these patents relate to many aspects of the design and manufacture of VIG, including: Assistance pillars of various styles and products; Pillar arrays of different geometries; Flexible and stiff edge seals made with solder glass and metal; Edge seals made by direct blend of the 2 glass sheets; Ports and tubes for leaving the internal volume; In-vacuum sealing of the edges; Contoured glass sheets; VIGs with several glass sheets; and VIGs with internal low emittance coverings.

This was accomplished in work that followed on from a 1988 Senior undergraduate job by Stephen Robinson, supervised by the author, at the University of Sydney School of Physics. These very first speculative samples were made utilizing two heating steps, as revealed in Figure 2. In the very first step, a stiff edge seal was formed between the glass sheets by melting solder glass at a temperature above 450C.

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After cooling, the sample was suspended from the pump out tube and evacuated. The internal surfaces of the sample were then outgassed during the 2nd heating action at a much lower temperature. After cooling to room temperature, the pump out tube was melted and sealed. The existence of a thermally insulating vacuum was demonstrated using a basic safeguarded hot plate apparatus [3, 5]

The Past, Present, and Future of the Vacuum Insulated Glazing Technology -  glassonweb.comVacuum Insulated Glazing (VIG) - Windows and Daylighting

During this program, which continues to this day, over 1000 laboratory VIG samples as much as 1 m x 1 m in size were made, with centre-of-glazing Uvalues as low as 0. 8 W m-2 K-1. More Details in VIG science and technology developed in this program were reported

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