92. How long have windows been using IG / Insulated Glass / Annealed Insulated Glass?

Insulated glass, sometimes called IG, Anealed Insulated or by old LOF ( Libby Owens Ford ) trade name – Originally called “Thermopane” or Thermo Pane” glass; This glass has been commercially available since the 1950’s. For fundamental concept hasn’t really changed much. Insulated glass consists of two or more pieces of glass which are bonded to, yet separated from, one another by a spacer bar. The space between the glass panes is an insulator by virtue of “dead air space”. This fabricated glass sandwich is glued together with sealants designed to keep the glass together and moisture out. The spacer contains a dessicant that removes moisture which might be residual from actual manufacture. Insulated glass seal failure occurs when moisture penetrates the edge seals and wets, or condensates within the air space.

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