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<p class="MsoNormal">Bear in mind that plaster in older storage buildings can contain asbestos. This is true of most pre-war structures in the USA that were termed “fireproof” in their original specifications. The plaster is usually a mixture of gypsum and
up to 60% asbestos fiber. Depending on your local regulations, you might not even be allowed to hang a hook in the wall now.<o:p></o:p></p>
<p class="MsoNormal">Gypsum plaster is hygroscopic. If water leaks into it, there is often a characteristic “bloom” with blistering of the paint and disintegration of the plaster. This is not especially hazardous (unless see above), but it makes a mess.<o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><b><span style="font-size:12.0pt;color:black">Paul Callomon MSc</span></b><span style="font-size:10.0pt;color:black"><br>
<i>Collection Manager, Malacology and General Invertebrates</i></span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;color:black">Academy of Natural Sciences of Drexel University, Philadelphia</span></b><b><span style="font-size:10.0pt;color:black"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;color:black">1900 Benjamin Franklin Parkway, Philadelphia PA 19103-1195, USA<br>
<i><a href="mailto:prc44@drexel.edu">prc44@drexel.edu</a> Tel 215-405-5096 - Fax 215-299-1170</i></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu>
<b>On Behalf Of </b>Tacker, Christopher<br>
<b>Sent:</b> Thursday, October 22, 2020 12:11 PM<br>
<b>To:</b> Lennart Lennuk <Lennart.Lennuk@loodusmuuseum.ee>; nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> Re: [Nhcoll-l] [External] earthen plaster or clay plaster<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p><b><span style="font-family:"Arial",sans-serif;font-variant:small-caps">External.<o:p></o:p></span></b></p>
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<span style="font-family:"Arial",sans-serif;color:black">Hi, Lennart,<o:p></o:p></span></p>
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<span style="font-family:"Arial",sans-serif;color:black">How hygroscopic are the plasters, and how do they fare when they get wet?<o:p></o:p></span></p>
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<span style="font-family:"Arial",sans-serif;color:black">You might want to get your geology/ mineralogy curator to do some XRD to identify the components.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:black">Regards,<o:p></o:p></span></p>
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<span style="font-family:"Arial",sans-serif;color:black">Chris Tacker<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:black">R. Chris Tacker, Ph.D., P.G.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:black">Curator of Geology<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:black">N.C. Museum of Natural Sciences<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:black">11 West Jones Street<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:black">Raleigh, NC 27601<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="color:black">From:</span></b><span style="color:black"> Nhcoll-l <<a href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>> on behalf of Lennart Lennuk <<a href="mailto:Lennart.Lennuk@loodusmuuseum.ee">Lennart.Lennuk@loodusmuuseum.ee</a>><br>
<b>Sent:</b> Thursday, October 22, 2020 7:47:48 AM<br>
<b>To:</b> <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> [External] [Nhcoll-l] earthen plaster or clay plaster</span> <o:p>
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<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
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<b><span lang="ET" style="font-size:10.0pt;color:yellow">CAUTION:</span></b><span lang="ET" style="font-size:10.0pt;color:black"> External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
<a href="mailto:report.spam@nc.gov"><span style="color:red">report.spam@nc.gov</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
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<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">Dear all</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black"> </span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">Do you have any experience about what materials use for collections rooms walls.</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">Is earthen plaster or clay plaster safe for collections?</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black"> </span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">Best regards!</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">Lennart Lennuk</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">Head of zoology</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">Estonian Museum of Natural History</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black">+372 6603404, 56569916</span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black"> </span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET" style="color:black"> </span><span lang="ET"><o:p></o:p></span></p>
<p class="xmsonormal" style="margin-left:.5in"><span lang="ET"> <o:p></o:p></span></p>
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