Double glazed glass, consists of two piece of glass panel separated by an aluminum spacer and sealed together with butyl and then structural sealant at the edge. Double glazing windows is filled with dry air or a noble gas, such as argon or krypton inside to isolate the heat exchange and reduce noise levels. The aluminum spacer is filled with silica desiccant pellets to ensure removal of any moisture in the airspace.
Double glazed glass is designed to keep homes warmer in the winter and cooler in the summer.