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This heading covers multiple-walled insulating units of glass, the most common type of which consists of two or more panels of glass (sheet, plate, float or even such types as hammered or cathedral) separated by a layer of dry air or inert gas, sometimes divided internally into compartments. These sheets are sealed around the edges by a metal, plastic or other joint which makes a completely airtight unit.
Another type of multiple-walled insulating glass consists of a sandwich of two sheets of glass with an interlayer of glass fibre.
These types of glass, which are used for glazing windows, roofs, etc., provide a degree of heat and sound insulation and reduce condensation.
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