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All Irwin Windows
utilize "Super A Glass" which consists
of 2 lites of glass seperated by an inorganic metal
spacer. Spacer corners are bent to be air/gas tight.
The spacer contains "Formula 40" which
absorbs the moisture vapor within the airspace.
The dual seal construction has
a primary seal of compressed polysobutylene (butyl)
and a secondary seal silicone. All Irwin Windows
have been certified to Class CBA through the IGCC
(Insulating Glass Certification Council) Program.
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