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Double Glazing is the colloquially and incorrectly used term for the technical term heat protection glass. This type of glass is made of several (usually two glass panes and in some Nordic countries, three panes (see triple) for better heat protection) of composite materials made with parallel flat glass plates. In recent decades, this technology is historically single-paned glass typically used in temperate industrialized countries. The main advantage is greater heat protection and therefore lower household energy costs making uPVC frames and doors common in households and commercial property.

Between the glass panes, dry air was commonly used as an insulating gas. Modern window frames now uses argon gas. Krypton gas is used substantially more expensive (in terms of prices) double-glazing products albeit rare. Thus, the reduced thermal conductivity perpendicular to the glass surfaces and the thermal insulation effect is very high.

For noise protection from the roads,  the units have used sulphur hexafluoride (SF6) as a gas filling.  For the side facing the road, sound reductions ranging from 40 dB to 42 dB may be achieved. Especially in industrial and commercial enterprises to using units of greater size. The global warming potential of sulphur hexafluoride is equivalent to 22,800 CO2. This is ten times as much as in common HCFCs. SF6 is therefore no longer used.

Modern glass products may use argon for sound protection with the resulting noise reduction attributable to lower thicker glass on the side of the sound. The use of laminated safety glass is a clear sound-absorbing effect. For example, a layer thickness of 3 mm + film + 3 mm clear sound insulation as a layer thickness of 6 mm. The film takes the vibrations of the two stuck to their glass panes.

The glass panes are at its outer edge separated by a spacer, which are made of aluminium, stainless steel or plastic, separated from each other. The spacers, usually 10-20 mm thick, on it a thermoplastic sealant (isobutylene), which is combined with compression determined with the glass surfaces of the thigh.

In recent times, conventional insulating glass has developed into a more sophisticated range of window and door products with additional benefits such as thermal insulation, sound insulation, UV protection and safety glass. The technical difference between them and the conventional insulation is mainly related to the structure. The specially coated glass and different gas fillings can result in significant benefits, including the additional benefit of sound insulation. In this context, the heat transfer coefficient in modern multi-glazed panes are markedly reduced compared to the older style glass structures. However, building design and spacer construction play a significant role in quantifying the benefits..