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How much UVA and UVB does my glass keep out.
Most people believe that ordinary window glass blocks UV radiation, making any other UV protection unnecessary indoors. This is half-truth at best. Window glass blocks UVB but lets much of UVA through. The percentage of UVA that passes depends on the type of glass and the type of coating on the glass. Window glass falls into three major categories: ordinary (clear) glass, reflective glass (allows to see in one direction much better than in the opposite one), and tinted glass. While all these types of glass block UVB, their capacity to block UVA varies considerably. As architectural fashion keeps moving towards larger windows, the impact of these differences is continuing to grow.
Clear glass allows up to 75% of UVA to pass. Tinted and reflective glass absorbs more of the UVA but still allows about 25-50% to pass; they also have the shortcoming of blocking more of the visible light than clear glass. There is also the so-called Low-E (low-emissivity) glass, developed to minimize heating and cooling costs. As far as UV is concerned, regular Low-E (the ones w/o special anti-UV coating, etc.) behaves similarly to clear glass: most UVB is blocked, most UVA gets through.
The best protection comes from the types of glass specially geared towards blocking UV rays, such as laminated glass and UV-blocking coated glass. Both filter out from 95 to 99% of all UV light. Neither is common in residential or commercial structures. Laminated glass, made of two layers of glass with a plastic layer in between, is used in some public buildings, such as airports and museums; it is also used for automobile windshields. UV-blocking coated glass is also used largely in special circumstances. All in all, whenever indoors, don't assume protection from the windows against UVA unless you know that special glass in installed.
Does my winshield keep out UV rays?
Most people believe that ordinary wi.
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