Structural glass bonding in aluminium windows improves insulation and reduces costs. In order to be able to provide energy savings in keeping with present and future legislation, modern aluminium windows use plastic profiles for thermal insulation. Well insulated frame structures consist of a large number of components. Increasingly stringent requirements increase the complexity and boost costs. Bonding technology in aluminium windows utilises the insulation glass for the thermal insulation of the aluminium profiles. The insulating glass, with its better insulation characteristics, covers the sash  frame and thus facilitates energy-efficient aluminium windows with simplified frame structures.