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<p class="MsoNormal"><span style="mso-fareast-language:JA">Sealing concrete floors: in part what you do depends on how well the concrete was originally rendered. If it was skimmed to a smooth, slightly glossy finish then that should take a thinner, solvent-based
sealant well. We recently did this for concrete floors in our public museum. <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:JA">If it’s rougher, however, or you can empty the room and roughen it with a machine, then two-pack epoxy is worth considering. This is what they put on workshop floors, and if correctly applied it’s tough,
easy to clean and durable. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:JA"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black;mso-fareast-language:JA">Paul Callomon<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black;mso-fareast-language:JA">Collection Manager, Malacology and General Invertebrates<i><o:p></o:p></i></span></p>
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<p class="MsoNormal" style="background:white"><b><span style="font-size:12.0pt;color:black;mso-fareast-language:JA">Academy of Natural Sciences of Drexel University</span></b><b><span style="font-size:12.0pt;color:black;mso-fareast-language:JA"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black;mso-fareast-language:JA">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><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:JA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:JA"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="mso-fareast-language:JA">From:</span></b><span style="mso-fareast-language:JA"> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu>
<b>On Behalf Of </b>Lennart Lennuk<br>
<b>Sent:</b> Saturday, May 15, 2021 5:28 AM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> [Nhcoll-l] FW: what materials use in collection storage rooms for walls, floors and ceilings.<o:p></o:p></span></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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<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">Hi<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">Because I had no answers to my questions, I try again
</span><span lang="ET" style="font-family:Wingdings">J</span><span lang="ET"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">Two question on the material use for collection storage room walls, floors and ceilings:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="ET"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="ET">Is using PVC-flooring in fluid collection and in areas where people work with collections ok?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang="ET"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="ET">Our new collections floors are planned to have concrete floors treated with
<a href="https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fconvergentconcrete.com%2Fproducts%2Fpentra-guard-ext&data=04%7C01%7Cprc44%40drexel.edu%7Caba9ae9758194df0be4508d91783b8d8%7C3664e6fa47bd45a696708c4f080f8ca6%7C0%7C0%7C637566676793314125%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=aRTilIC5V8PBXij8FcJH%2F5bIMLRQIaz%2Fd6uY2Af%2FZWE%3D&reserved=0">
<span style="color:windowtext">Pentra-Guard</span></a>. In description I read it is based on lithium.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">Some of the information I have found this far:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">I found this in NPS Museum Handbook:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">„Treat concrete floors with a sodium silicate sealing/curing agent. This hardens and increases the density of the surface of the concrete, helping protect it from cracking, dusting, and other damage.
The floor should be easy to clean without the use of chemical cleaners or water“<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">And also an short introduction of an article about lithium chloride:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">„UTILIZATION OF LITHIUM CHLORIDE SOLUTIONS FOR CONTROLLING RELATIVE<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">HUMIDITY IN MICRO ENVIRONMENTS<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">BEYER, SARAH R. and STEPHEN L. WILLIAMS, Museum of Texas Tech University, Lubbock,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">Texas 79409-3191<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">The utilization of saturated salt solutions at known temperatures has been used by the museum<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">community for establishing desired relative humidities in microenvironments. To alleviate the<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">expense of acquiring different chemicals, the authors investigated the feasibility of using different<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">concentrations of lithium chloride for establishing and controlling relative humidity. Much of the<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">information about the relationship between concentration and relative humidity was extrapolated<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">from the literature. Subsequent testing demonstrated the usefulness of this information and how it<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET">might be used for initiating controlled changes in microenvironments.“<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET" style="mso-fareast-language:ET">Best regards<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET" style="mso-fareast-language:ET">Lennart Lennuk<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET" style="mso-fareast-language:ET">Head of collections<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET" style="mso-fareast-language:ET">Estonian Museum of Natural History<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET" style="mso-fareast-language:ET">(+372) 6603404, 56569916<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="ET"><o:p> </o:p></span></p>
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