Insulating Glass, often called insulated glass, double glazing, is a combination of two or more panes of glass spaced apart with a aluminum spacer bar and hermetically sealed with a primary and secondary sealant to form a single unit with one or more air spaces in between glass panes. Insulated glass units improve the thermal performance, thus significantly reducing heating and air-conditioning costs. Insulating glass units also reduce interior condensation in cold climates, and increase comfort near windows, thus maximizing the usable interior space.

By combining Low-E coatings, clour glasses, reflective coatings, silk-screened patterns, laminated glass products and more, a wide variety of insulating glass configurations are available to satisfy a wide range of performance and aesthetic requirements. IG units can be fabricated to meet energy saving requirements, and sound control requirements. IG units can be designed to reduce heat loss and solar heat gain entering the building, with a minimal reduction of visible light transmittance.