Many organic materials, such as carpet, fabrics, paper, artwork,
paints, and wood may fade upon exposure to sunlight. Window
selection can influence the type and intensity of transmitted
radiation. The most harmful radiation in sunlight are the ultraviolet
(UV) rays, which are the most energetic and thus most likely
to break chemical bonds, leading to fading and degradation.
Glass blocks all UV radiation below 300 nm, but transmits UV
from 300-380 nm. Coatings on glass can reduce the UV transmitted
by up to 75 percent. UV absorbers can be incorporated into thin
plastic films in multilayer windows or as an interlayer in laminated
glass. In both cases, the UV transmission can be reduced to
less than 1 percent. However, it is important to note that the
remaining visible light that is transmitted can still cause
serious fading in some materials.
Reduced Fading, Efficient
Windows Collaborative, College of Architecture and Landscape
Architecture, Twin Cities Campus, University of Minnesota.