Glass related R&D at the Fraunhofer Institute for Silicate Research ISC covers a broad spectrum from specialty glass for technical applications to glass surface finishing with functional or decorative coatings. It also includes concept designs for the restoration and preservation of historic glass paintings or other glass items of cultural heritage. A recent project, for example, regarded the conservation of the glass façade of the public indoor swimming pool located at Stuttgart Feuerbach. At glasstec, held from 20th to 23th September 2016, the Institute will present this and other selected R&D results at the Fraunhofer booth D64 in hall 11.
Conservation concept for the glass façade of the public swimming pool building at Stuttgart Feuerbach
Crystalline deposits fog the painted glass panes like a white veil.
© K. Selsam-Geißler, Fraunhofer ISC
The concept was designed by a team of researchers from the International Convention Center for Cultural Heritage Preservation IZKK which is part of the Bronnbach Branch of the Fraunhofer ISC. The façade of the public swimming pool building at Stuttgart Feuerbach features a double glazing which displays obvious signs of corrosion. Of particular concern are the colored glass elements which were painted by the artist HAP Grieshaber between 1959 and 1964.
In order to prevent further damage to the artistically valuable façade, the authorities in charge (Hochbauamt Stuttgart) commissioned the Fraunhofer ISC to design a suitable conservation concept and also to develop an effective protection coating for subsequent conservation of the restored façade.
To find the best suited long-term concept for cleaning, restoring, and conserving the glass paintings, the IZKK researchers analyzed sample panes of the façade glazing. Analysis methods included light microscopy, cross section preparation and a combination of X-ray spectroscopy and scanning electron microscopy. An unpainted sample glass pane was used to determine the composition of the glass and to analyze the glass surface, the composition of the paint was analyzed from a painted glass pane.
The investigation revealed crystalline deposits of calcium and sodium silicate compounds which fogged the pane like a white veil and so not only impaired the view but also covered the color paintings. The leaching took form in massive glass corrosion between the double glazing. In some areas the corrosion depth reached 20 micrometers. The edge seal of the insulating glass had given way and so made room for condensation between the panes of the double glazing. Glass components began to leach out and corrosion products to accumulate, until the surface of the glass was partly dissolved.
Based on these results, a tailored concept was designed to carefully clean the façade without affecting the color paintings. The IZKK team then went on to develop a special protection coating which they tested on self-made glass samples matching the façade elements. These measures are meant to preserve the transparency of the façade and to improve the »readability« of the glass paintings. In order to prevent further corrosion, the façade panes are to be reincorporated into double glazings using latest standards and technology.
Glass finishing and coating
Apart from such glass conservation concepts, Fraunhofer ISC develops functional coatings for architectural glazings. Dust-repellent and anti-reflective properties can be combined in one single coating. The coating creates a special glass surface structure which provides for self-cleaning through wind and rain. This finishing system has already stood the test of time on external glazings of the Cologne Cathedral. Another special coating was developed for window panes to improve the lighting condition of indoor rooms. The coated window panes promote the passage through the glass of those wavelengths of light that govern our hormonal balance and have a positive effect on our biorhythm.
Indoor climate control is another important research topic of the Fraunhofer ISC. A recent development features highly porous glass flakes which can absorb, store, and release excess moisture to regulate indoor air humidity. Incorporated into plaster or wall paint, the glass flakes help maintain a comfortable indoor climate and prevent mildew and mold.
Marie-Luise Righi | Fraunhofer-Institut für Silicatforschung ISC
Medica 2018: Mobile motion feedback to help patients reduce relieving postures when walking
07.11.2018 | Technische Universität Kaiserslautern
Medica 2018: Control with your feet - computer game to help prevent thrombosis
05.11.2018 | Technische Universität Kaiserslautern
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
Physicists at ETH Zurich demonstrate how errors that occur during the manipulation of quantum system can be monitored and corrected on the fly
The field of quantum computation has seen tremendous progress in recent years. Bit by bit, quantum devices start to challenge conventional computers, at least...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
14.11.2018 | Materials Sciences
14.11.2018 | Health and Medicine
14.11.2018 | Life Sciences