Insulation Glass Unit

a unit used in construction comprising two or more sheets of glass that are hermetically sealed along the perimeter by the frame. The space between the sheets is filled with dehydrated air, which prevents the formation of a condensate at low temperatures and the fogging of the panes during winter. Sealing is accomplished by attaching the glass to a metal frame, for example, a shaped aluminum frame, by using synthetic sealants (glued insulation glass units), or by welding along the perimeter with a lead band (welded unit).

Insulation glass units produced in the USSR are 4 m long and 2 m wide. The thickness of the glass sheets is 3–6 mm, and the distance between the sheets is 12–20 mm. The heat-transfer coefficient is 2.8–3.0 watts/(m²-°K). Insulation glass units are used in public, industrial, and residential buildings in single casings; they eliminate the necessity for separate glazing operations in double casings.