Kathy,
I don't know much about the various options here but....this institutions' museum was completed in 1986. All of the windows in the galleries (a large bank of windows in the main stairwell and clerestory windows) are dual pane, low-e glass that is coated with a 3M, "Scotchtint"
(clear #SHZCLL) ultra-violet filter. This stuff is stated to block 98% of ultra-violet light and, as of '92 when levels were last accurately measured (!), this filtration worked well (we have since added coated polyester "drapes" for increased filtration and lighting control). This
filter is applied to the inside of the windows, can be washed with "anything from ammonia to vinegar", is shatter resistant and is transparent. According to the supplier, this material can be expected to lose 1/4 of 1% efficiency per year after 12 years. I am also told that it can
be pealed off so that new coating can be applied. Apparently 3M's new material (RE50 NAL) uses nickel content for increased heat and glare protection.
Bill Low
[log in to unmask]


Kathy Borgman wrote:

> I am a new subscriber to the Museum List.  I thought this would be a great
> place to ask these questions, "What kind of UV filter works best overall,
> What kind of UV filter works best on old glass?  What about UV glass if
> making new storm windows? What should I avoid?"  I've been getting varying
> opinions and would like to hear from someone who has been successful in
> utilizing UV filters. I've already enjoyed the list. Thanks for any help out
> there. Kathy
>
> [log in to unmask]
>
> Kathy Borgman
> Friends of Arrow Rock
> Arrow Rock, MO  65320
> office: 660-837-3231
> home:  660-837-3350
>
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