Insulated Glass Units / Double Glass Units comprises of two panes of glass. The hollow aluminum spacer is then shaped to suit with a strip of poly-isobutylene applied to both sides providing the primary seal and acts as an excellent vapor barrier. The spacer which is filled with molecular sieve (Desiccant) to prevent condensation from forming after sealing is positioned between the 2 panels of glass and then pressed together. Finally the silicone secondary seal is applied to the perimeter void around the unit.

A primary seal of poly-isobutylene is incorporated into the system which provides maximum protection against moisture vapour transmittance. It also helps reduce thermal edge conductance between spacer and glass, thereby increasing energy savings. The secondary seal provides a good tensile strength to the glass to glass edge. It provides low-vapor and gas diffusion, thus providing excellent adhesion between the glass and the metal spacer with short curing times.

The primary reason for using DGUs is to cut down on thermal heat coming from outside. Thermal insulation primarily depends upon the dryness of the air inside the IGU, as well as the quality of the hermetic seal. Working Principle: DGUs work on the principle of reducing conduction and convection heat transfer across the unit. Dry air is a poor conductor of heat. Due to the air-gap, the conducted heat through glass is reduced significantly as it reaches the second pane. The use of SolarTint, SolarRef and SolarComfort Low-E glass will further reduce the load on the cooling system.