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On 23 Feb 2001, at 14:31, Fuhriman, Mark wrote: > Well, does glass become more brittle over time or not? I thought it did. > If it does, something has to give, so I'd say the glass must become thicker. > Probably not thick enough to measure at home though. It becomes "more brittle" due to the accumulation of microcracks caused by water molecules on an atomic scale. There was a good article on this in Scientific American sometime in the last 20 years, I think. I don't think this leads either to a measurable change in thickness or to any change in the UV transmission properties. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe