What material is double glazing made from and why?

Double glazing typically consists of two panes of glass separated by a spacer bar and sealed together, creating an insulated air gap between them. The glass is usually made from low-emissivity (Low-E) glass to enhance energy efficiency by reducing heat transfer. The air gap can also be filled with inert gases like argon or krypton to further improve insulation. This construction minimizes heat loss and reduces noise, making it an effective solution for improving energy efficiency and comfort in buildings.