What are Insulated Glass Units & How do They Work to Save Energy?
An insulated glass window unit is made from two or more panes of glass bonded to an aluminum spacer. The spacer itself is filled with a desiccant – a material that absorbs moisture from the air to dry out the space between the panes. The glass panes are sealed to the dessicant-filled spacer using polysulfide, polyisobutylene, silicone, urethane or other sealants. Premium sealed glass units may use two sealants: an inner seal of butyl as that material provides both a strong mountant and an effective moisture seal, and an outer seal of silicone.
