Ms. Sperlin,

The film you may be thinking of that provides security and UV 
protection is probably a component of laminated glass where a 
membrane is bonded between two layers of glass (think of a car 
windshield). It would have to be mounted in a secure frame. An 
installation in an historic wood frame window would only be as strong 
as the wood muntins.

You can find info about surface applied UV films at the NPS websites 
listed below:

http://www.cr.nps.gov/museum/publications/conserveogram/03-10.pdf

http://www.cr.nps.gov/hps/tps/technotes/PTN30/Introduction.htm


Mike McHugh


>Date:    Sat, 23 Apr 2005 18:35:06 -0700
>From:    Lucy Sperlin <[log in to unmask]>
>Subject: UV+Security window film
>
>Have any of you heard of or used a window film that is both a security
>(break-in) control device and also provides UV protection?   Apparently it
>is applied directly to the window, preventing the glass from shattering if
>someone tries to break it to break in. (Or it shatters, but they can't break
>it to climb in the window.)  It is being considered at our historic house,
>and I'd like to hear from anyone who has experience with it or who has
>looked into it and decided either for or against it.
>
>Our house has mostly old (pre-1900) glass.  I am concerned about the lasting
>quality of the UV filter (the security expert suggesting it has told our
>director that the UV filter quality does not diminish over time).   After
>hearing about other directly applied films that buckle or bubble over time
>and end up looking bad, I also wonder about its lasting quality in that
>regard as well as the degree of difficulty of removal if removal becomes
>necessary.
>
>If there is more than one company making such a product, is there a
>difference between them?
>
>Finally, if the impermeability is true, it seems to me that it must have to
>wrap around off the edges of the glass to the window frame, or the glass
>simply could be broken out around the edges. What would be the effect on
>wood window frames?
>
>I would really appreciate anything anyone can tell us..
>
>
>Lucy Sperlin
>
>Patrick Ranch
>
>Chico/Durham, CA

-- 
*****************************************************************
Michael McHugh, AIA
LEED Accredited Professional
E. Verner Johnson and Associates
Museum Architects and Planners
222 Berkeley Street,  Suite 1350
Boston, MA 02116
tel:   617-437-6262
fax:  617-437-1272
http://www.vernerjohnson.com

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