|Hi,I have query related to UV index. If there is
an UV index of 15 affecting a room made of clear
glass, no special coating, no lamination, just
simple breakable glass of thickness 3mm, how much
UV will pass through and how much will be blocked
by this 3mm thick plain, clear, no
|Question Date: 2012-09-18|
Well, it does depend exactly on the
composition of the glass. But you should be able
to purchase commercial window glass that blocks
75% of UV radiation. Here is a site you can go
to read more. It is an interesting article from
the University of Massachusetts, Amherst.
Well, I don't know how different amounts of
UV light affect people, but I can tell you that
the UV index is not an exact scale measured in
watts per square meter or any other physically
measurable unit. I'm pretty sure that 3mm of
glass will provide pretty good protection
against sunlight under almost any conditions,
but I don't know what kinds of coatings are used
on typical glass for this purpose.
UV penetration depends on the thickness of a
glass. To know the amount of UV ray penetration
for a 3mm glass, we had to measure it with a
spectrometer. Glass can not completely prevent
ultraviolet ray penetration, but at least 70% of
the visible light should be filtered.
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