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<p class="MsoNormal"><span style="mso-fareast-language:JA">To seal ground-glass stoppers and plate-type lids (such as Whittall-Tatum jars that lack a gasket) I use dielectric grease (Dow-Corning #4 Compound). This is a non-setting clear grease with a silicone
filler that does not, as far as I have been able to tell, contaminate fluids. You can see the tech data sheet at
<br>
<a href="https://www.aircraftspruce.com/catalog/cspages/dc4.php">https://www.aircraftspruce.com/catalog/cspages/dc4.php</a><o:p></o:p></span></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">Be aware that if you use regular silicone caulk on older soda glass it seals very well but can be pretty difficult to release. It works best on flat flange-to-face joints, where its good gap-bridging
qualities are important, but if you use it on a tapered ground-glass stopper you’ll likely never be able to open it again.
<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="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>
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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>James Maclaine<br>
<b>Sent:</b> Wednesday, January 11, 2023 7:09 AM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> [Nhcoll-l] Putty For Sealing Jars<o:p></o:p></span></p>
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<p><b><span style="font-family:"Arial",sans-serif;font-variant:small-caps;color:black">External.</span></b><b><span style="font-family:"Arial",sans-serif;font-variant:small-caps"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">Happy New Year!<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">Hope someone can help with a large jar sealing question. In the past we have used a kind of putty (made by Arboseal) to seal flat glass plates to the top of some of our largest jars and containers.
This was especially useful in the case of some of the older jars where the top is not completely flat and the putty could fill in the gaps. It isn’t an ideal solution (and makes opening the jar a bit of a chore) and in some cases the putty has hardened and
cracked but on the whole it has fairly effectively slowed down evaporation over several decades. <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">However, in the cases where the old putty has to be replaced I can no longer find the same brand for sale online, so can anyone tell me where I can purchase something similar and reliable that
I could use for this? Or ideally, let me know of a better way of sealing a flat lid on an uneven jar top (please don’t suggest stretching parafilm over it!).
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">As these are large containers for specimens that would be difficult to find alternative storage for (see attached), I’d like to keep using them if possible. They would also be prohibitively expensive
to replace.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">Any suggestions would be much appreciated.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB">James<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-GB"><o:p> </o:p></span></p>
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