Presentation
Insulating glass units

The first patent for insulating glass was filed in 1865 by an American glassmaker, T.D. Stetson.

More than a century later, in 1942, Libbey-Owens-Ford developed "Themiopane", a technique for joining two sheets of glass using a metal joint (ductile metal) welded to the glass (figure 1), with the same coefficient of expansion.

In the 1960s, the "Tege" (Twindow Glass Edge) was launched: this is glass-to-glass, welded glass-to-glass (figure 2), without any interposed material. The included air space is 4.8 mm thick.

In Germany, insulating glass units expanded rapidly with the introduction of sealed units and glazed units: