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<p class="MsoNormal">I think that is correct – a 10 year life span. However, I suggest that you contact 3M with your problem and see what they say.
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<p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Script MT Bold";color:#385623">Gretchen Anderson</span></b><b><span style="font-size:14.0pt;font-family:"Script MT Bold";color:#7030A0"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Conservator<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Carnegie Museum of Natural History<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">(Preferred pronouns: she/her)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><a href="mailto:AndersonG@CarnegieMNH.Org"><span style="color:#0563C1">AndersonG@CarnegieMNH.Org</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Mobile: 412-420-9083<span style="color:#385623"><o:p></o:p></span></span></p>
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<p class="MsoNormal"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> <b>
On Behalf Of </b>Mascord, Lucie<br>
<b>Sent:</b> Monday, January 23, 2023 6:19 AM<br>
<b>To:</b> Kristian Murphy Gregersen <kgre@kglakademi.dk>; NATSCA@JISCMAIL.AC.UK; NH-COLL listserv (nhcoll-l@mailman.yale.edu) <nhcoll-l@mailman.yale.edu><br>
<b>Subject:</b> Re: [Nhcoll-l] 3M window film turning hazy<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-GB">I think 3M claim the life of the film to be 10 years from memory
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<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB"><img border="0" width="591" height="139" style="width:6.1547in;height:1.4464in" id="Picture_x0020_3" src="cid:image001.jpg@01D92F11.B1CCF890"></span><span lang="EN-GB" style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:EN-GB">From:</span></b><span style="mso-fareast-language:EN-GB"> Nhcoll-l <<a href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>>
<b>On Behalf Of </b>Kristian Murphy Gregersen<br>
<b>Sent:</b> 23 January 2023 11:02<br>
<b>To:</b> <a href="mailto:NATSCA@JISCMAIL.AC.UK">NATSCA@JISCMAIL.AC.UK</a>; NH-COLL listserv (<a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a>) <<a href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a>><br>
<b>Subject:</b> [Nhcoll-l] 3M window film turning hazy<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Dear colleagues<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">We’ve encountered a small problem at a local museum concerning their UV window film.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">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></span></p>
<p class="MsoNormal"><span lang="EN-GB">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></span></p>
<p class="MsoNormal"><span lang="EN-GB">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></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><img border="0" width="227" height="303" style="width:2.363in;height:3.1547in" id="Billede_x0020_2" src="cid:image002.png@01D92F11.B1CCF890"></span><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">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></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">All the best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Kristian<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:4.5pt;background:white"><span 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 style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:DA">Kristian Murphy Gregersen<br>
</span></b><span 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>
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