Choosing your windows

How is double glazing made?

A double glazing window comprises two panes of glass, separated by a spacer bar and seals to create a hermetically-sealed environment. The cavity width between the two panes, air or another gas filling used and the type of spacer bar, are all key factors in the unit’s final energy, solar and acoustic insulation properties.

The cavity is filled under vacuum conditions with either dehydrated air or an inert gas to improve insulation and prevent condensation within the unit. Depending on the gas filling used and the type of window, the cavity width for a double glazing window is generally between 4 to 20 mm.
The recommended cavity width for Low E energy saving double glazing window when filled with dehydrated air is 16mm – and 14mm when the cavity is filled with argon gas.
The cavity width requirements for acoustic insulation glazing depend very much on the specific insulation requirements and need to be advised on a case by case basis.






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