Effects and possibilities of our UV and light protection

The entire harmful irradiation in the area marked yellow is let in unobstructed by standard ""UV protection panes and films with acceptable colour reproduction."

The options enabled by radiation protection up to this day

Shading: Ideal UV and IR protection – however, no utilisation of sunlight during the day, which results in the possible hazard of irradiation damage from light sources.

Protective films: the better the UV protection, the worse the light quality due to discolouration and absorptions. These films also age, as a rule, relatively rapidly.

Laminated safety panes: The UV protection provided by all commercially available standard laminated panes with PVB films does not up to this day lead to a photochemically favourable, effective irradiation protection for sensitive materials. The films in these panes absorb, in their new condition, highly energetic irradiation harmful to materials only up to approx. 355 nm for 0.38 mm film or (in the case of particularly strong films) 1.52 mm up to approx. 385 nm. As the film ages, this value decrease continuously due to the degradation of the irradiation-absorbent chemical additives.

Continuous protection by coated PVB film

In our custom irradiation-protection panes designed to fit an individual object, short-wave irradiation protection up to approx. 420 nm can be ensured with 1% spectral transmission. Not as an integrative value across a larger irradiation range, but instead as a defined point in the
spectrum.

Below this value, the transmission rate for our specific type of museum glass decreases to 0% within a few nm! These values are attained at a colour-reproduction value of up to 99.8% (depending on the UV edge).

Comparison of different protective panes in a single project. Our custom protective glass (red), adapted to each individual object, and a comparison product (heat protection, insulated glass with vaporisation). Readily recognisable: the improved colour reproduction in the red band range with targeted and consistently lowered transmission in the visible range, as well as a clearly improved blockage of harmful UV and short-wave radiation.

Additional IR protection - and heat protection for the summer

As of approx. 850/900 nm, additional IR protection with a decrease in the remaining transmission of 90%, can be used starting at 1.200 nm up to 100%.

The reduction of IR transmission also prevents the damage potential resulting from excessive heating up of an object due to the absorption of the irradiation warmth.

Free selection of the glass type

A decisive advantage of our custom UV-protective panes is that you have complete freedom of choice concerning the base panes.

Whether you seek to combine coated glass by the manufacturer "X" or white glass by the manufacturer "Y" with our filters is not a matter of concern here; this is determined solely based on the needs of the object, along with the budget and availability.

The following panes were already combined with our filter structures:

Float glass
Float glass (thermally agitated)
Luxar®, a coated white glass made by Trösch
various products by Schott
Lambert's hand-blown panes

We will gladly send you our standard glass list – please contact us.

Optional insect repellent

Another advantage is that in the course of the expansion of the bands to 430 nm by our protective glass, insect-repellent properties can be attained for light-fixture glass or windows. You will find more information on this topic at: here.

Reduction of visible irradiations and grey filtering

If also a reduction of irradiation in the visible range of the spectrum to minimise degrees of illumination (i.e. 50 Lux) should be necessary, it is also possible to apply a grey filter adapted to the given colour reproduction (up to eight bands). This filtering is attainable without changing the reflection properties of the glass.

Here, you can find out more about a UV- and IR-protective glazing performed by us as a classic exterior protective glazing for a church window.

Datenblätter unserer UV++ Schutzgläser

Von den wichtigsten Glas- und Filterkombinationen finden Sie hier die entsprechenden Datenblätter.

Bei objektspezifischen Glasentwicklungen können im Rahmen des Entwicklungsauftrages auch Daten für die individuell auf Ihr Objekt abgestimmten Gläser gemessen werden.

Muß es immer UV++ Schutzglas sein?

Nein!

Denn wie auch bei der Frage Schutzverglasung oder Schutzgitter liegt uns bei der Suche nach dem optimalem UV-Schutz vor allem das Objekt am Herzen und wir nehmen uns angedenk unserer Restaurierungsethik die Freiheit auch Lösungen außerhalb des Glases zu finden, wenn diese sinnvoller sind.

So sollte z.B. in St. Ulrich und Afra in Augsburg neben unseren UV++ Gläsern in Teilbereichen Lichtschutzstoff Verosol 816 eingesetzt werden.

Dieser hatte serienmäßig ca. 23% Transmisson! Da die Gläser der Bleiverglasung die Transmission von UV-Strahlung ab ca. 320 nm nahezu ungehindert zulassen hätte der serienmäßige Lichtschutzvorhang gerade die gefährliche kurzwellige UV-Strahlung noch zu 22-23 % durchgelassen!

Wenn man dies nun mit den bekannten Ergebnissen von Hilbert und Judd verknüpft bliebe mit dem Vorhang immer noch ein relativer Schädigungsfaktor von 31 bei 365 nm!

Um auch in diesem Breich einen 100%tigen UV-Schutz zu erzielen ersannen wir eine Kombination aus dem Stoff und einer speziellen UV++-Schutzfolie deren Filterkante mit 1% Transmission bei 390 nm liegt um so einen maximalen Schutz zu erreichen.

In Kürze verfügen wir über eine weiterentwickelte Folie bei der die 1% Kante bei 400 nm liegen wird.

The damaging irradiation hitting the contaminated material leads to an increase in the energy level for the electrons in our UV protection. The high binding powers in the contaminated material make it extremely resistant, and our UV protection does not disintegrate. In xenon-aging tests, the 150-year equivalency was exceeded.

If the irradiation hitting the contaminated material decreases, then – along with the release of long-wave, photochemically-ineffective warmth irradiation – the original energy level is restored.

Our protective glass pane heats up slightly (by 2-4° Kelvin) and dissipates the energy evenly and gradually to the surrounding air.

Temperature comparison: at left, a leading protective glazing; at right, our UV- and IR-protective glazing. The values determined in this context were confirmed in an analysis performed by Dr. habil. Jörg Seele, Doctor of Engineering (from the Institute for Structural Analysis and Renovation Planning, Munich).

Ideale museumsgerechte Farbwiedergabe des einfallenden Lichtes ohne visuell merkbare Glasfärbung wie hier im Luftbildarchives des Bayerischen Landesamtes für Denkmalpflege.

Wenn es für das Objekt sinnvoller ist haben wir auch die Möglichkeit Lichtschutzstoffe wie z.B. Verosol die noch 30% Transmission im gefährlichen kurzwelligen UV-Bereich haben mit Hilfe unserer UV++ Folie zu optimieren (unterer Teil). Im oberen Bereich, wie auch in den komplizierten Maßwerkformen wurde der UV-Schutz mit Hilfe unseres UV++ Glases umgesetzt wie hier im Projekt St. Ulrich und Afra in Augsburg

Hier ein Beispiel für die komplizierten Maßwerkstrukturen von St. Ulrich und Afra in Augsburg. Diese konnten mit Hilfe unseres UV++-Schutzglases dauerhaft sichtbar gehalten werden; Stoff hätte sie verdeckt.