Protective glazing - More security with optimized radiance filtering

For the preservation of the Imperial Window in the Nuremberg church St. Lorenz (completed in 2006) , the surface temperature on the medieval glass paintings – and with that, also the stress load on the paint layers – was to be reduced.

An additional objective in this context was the protection of the conservation materials applied in the course of this work from the damaging radiation in the visible as well as invisible light.
Since the typical options for radiation protection in use up to this point in time could not be individually co-ordinated to the particular object to be protected, the glass conservator Martha Hör and the architect Alexandra Fritsch (with the involvement of Dr. Susanne Fischer and Dr. Matthias Exner from the vom Bavarian State Office for Monument Conservation) proposed the engineering of a new UV- and IR-protective glazing.

This glazing was developed by the engineer Rolf Sandner (Bureau of Freelance Engineers) and implemented in co-operation with us.

The high-tech glass enables precise filtering of the UV, VIS, and IR radiation with a simultaneously very slight colour change in the light which is opaque and no change in the reflecting light.

For the imperial window, a single-pane glazing was used, which also enabled the complex cutting to size just as for the current custom window, without difficulty.