A coated or tinted glazing with optical properties that is transparent to some wavelengths of energy and reflective to others. Typical spectrally selective coatings are transparent to visible light and reflect short-wave and long-wave infrared radiation.

This term applies to two or more panes of glass separated by insulation at the edges and air in the centre to provide greater thermal efficiency to a window.

An inert gas, usually argon, is sealed between the panes of glass in a window instead of air. Gas is a better insulator than air, increasing the thermal value of the window.

It is the mandatory minimum specification for windows and doors used in Australia. It includes compliance with the Glass Standard AS 1288 to ensure safety and structural performance.