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<p class="MsoNormal">I think 3M claim the life of the film to be 10 years from memory
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><img width="591" height="139" style="width:6.1562in;height:1.4479in" id="Picture_x0020_3" src="cid:image003.jpg@01D92F1C.765C23C0"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu>
<b>On Behalf Of </b>Kristian Murphy Gregersen<br>
<b>Sent:</b> 23 January 2023 11:02<br>
<b>To:</b> NATSCA@JISCMAIL.AC.UK; NH-COLL listserv (nhcoll-l@mailman.yale.edu) <nhcoll-l@mailman.yale.edu><br>
<b>Subject:</b> [Nhcoll-l] 3M window film turning hazy<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear colleagues<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We’ve encountered a small problem at a local museum concerning their UV window film.<o:p></o:p></p>
<p class="MsoNormal">Between 2011-2014 the museum had installed UV film (3M™ Sun Control Window film Prestige 70 Exterior) on 33 of it’s windows as a means to limit the amount of UV and heat in its exhibition rooms. The windows are all secondary glazed, and
the film was mounted on the outer surface of the secondary glazing.<o:p></o:p></p>
<p class="MsoNormal">To start with the films were clear and performed as promised by the company. As the years went by, the film started to turn opaque, hazy, and a bluish grey powder appeared on its surface.<o:p></o:p></p>
<p class="MsoNormal">This has happened to all of the windows mounted with the UV film, no matter if they’re facing North, South, East or West. Even the windows facing other buildings have this problem, so sunlight might not be the issue. That said, areas of
the windows that never get any direct or indirect light from the outside do not appear to have been affected.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img width="227" height="303" style="width:2.3645in;height:3.1562in" id="Billede_x0020_2" src="cid:image004.png@01D92F1C.765C23C0"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are wondering if anyone else has had the same experience with UV window film, and/or if anyone has any ideas as to why this is happening?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">All the best,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kristian<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:4.5pt;background:white"><span lang="EN-US" style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">–––––––––––––––––––––––––––<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:5.0pt;background:white"><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">Kristian Murphy Gregersen<br>
</span></b><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">Teaching associate professor<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:5.0pt;background:white"><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">Head of Natural History Programme<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:5.0pt;background:white"><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">Institute of Conservation<br>
<br>
<b>M:</b> </span><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#FA4B0A;mso-fareast-language:DA">+45 41701764</span><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:130%;background:white"><b><span lang="EN-US" style="font-size:8.0pt;line-height:130%;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">Royal Danish Academy –</span></b><span lang="EN-US" style="font-size:8.0pt;line-height:130%;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:130%;background:white"><span lang="EN-US" style="font-size:8.0pt;line-height:130%;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">Architecture, Design, Conservation<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:5.5pt;background:white"><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA"></span><span lang="EN-US" style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">–––––––––––––––––––––––––––<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:4.0pt;background:white"><span lang="EN-US" style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">–––––––––––––––––––––––––––
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:3.0pt;background:white"><b><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">W:</span></b><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#4D4D4D;mso-fareast-language:DA"> </span><span lang="DA" style="color:black;mso-fareast-language:DA"><a href="http://www.royaldanishacademy.com/"><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#FA4B0B">www.royaldanishacademy.com</span></a></span><span lang="EN-US" style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#FA4B0B;mso-fareast-language:DA"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:4.5pt;background:white"><span lang="EN-US" style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">–––––––––––––––––––––––––––<o:p></o:p></span></p>
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