What is an Insulated Glass Unit?

The IGU or Insulated Glass Unit is the glass assembly mounted inside the frame of a window. The IGU commonly has 2 separate glass panes bonded to what is called the spacer or the Super Spacer. Spacers are commonly made of a rubber material and sometimes bonded to vinyl and they keep the two panes separated so that solar heat transfer can not take place from the exterior facing glass pane and the interior glass pane. They maintain the Air Gap between the two panes of glass solely for insulating purposes and is often filled with a type of inert gas to further improve insulation. See the diagram on Simonton’s web site.

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