Insulating glass (IG) consists of two or more glass window panes separated by a vacuum or gas-filled(Air,Argon) space to increase a window's thermal performance by reducing the heat gain or loss. Insulated glass units go by different names “double glazing” or “double-pane glass windows.” As a unit since most of the parts are dependent on another for proper performance. Unlike single-pane glass, Insulating glass units are sealed with a primary seal and a secondary seal of silicone. Insulating units are designed to absorb stress on the unit caused by thermal expansion and pressure, provide a barrier to water and moisture infiltration, provide a gas-tight seal to prevent loss of any specialty gas fill and create a barrier that reduces condensation.