I’ve been following the evolution of Southwall Technologies for years–well, decades. The company invented the low-emissivity coating in the 1970s, but rather than coat glass directly, the company coated plastic film, which it then suspended between panes of glass. This created two air spaces (triple glazing), further improving energy performance. The company called this suspended low-e film Heat Mirror.
Until now, Heat Mirror was an option for windows, but not large curtainwall glazing systems that rely on “structural sealant” to hold the pieces of glass in place. (Structural glazing now accounts fully a third of the glass going into commercial buildings, according to Southwall.)
That has now changed. Southwall Technologies and Dow Corning announced yesterday a new Heat Mirror system for structural glazing applications.