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<div class="moz-cite-prefix">... in this case, cracking should be
restricted to the neck. Such problems can also occur without
clamps, if the glass stopper (during higher temperatures) slips a
bit deeper into the neck, and then, when the specimens containers
is cooled down again (and shrinks this tiny little bit after the
neck expanded under higher temperatures), the stopper causes the
neck to break.<br>
<br>
But in this case, cracks are restricted to the upper portion of
the neck only.<br>
<br>
If it is glass corrosion, the microcracks (which are hardly
visible against the light unless major fissures and cracks form)
are all over the specimens container.<br>
<br>
Third option: because of increased pressure/underpressure mediated
through temperature fluctuations (could be up to 2 bar!), either
the bottom blasts off, or the stopper might crack (depending on
how well it is designed - quite common though in specimen jars
with flange and greased glass plane as cover).<br>
<br>
All the best<br>
Dirk<br>
<br>
Am 23.03.2015 um 14:00 schrieb Andrew Cabrinovic:<br>
</div>
<blockquote
cite="mid:9E5E778C9D89A7438906714AB9A73AD50130A0720D@EXC-SMITH.nhm.ac.uk"
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I
am wondering if the metal clamp itself might have been a
factor with the breaking jar? – relative thermal properties
of metal and glass.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">When
we moved collections into a temperature-controlled facility,
a number of cylinder-shaped jars (albeit not Whitall Tatum)
whose lids were secured with such clamps suffered cracking.
In this case the jars appeared to be fine with the clamps
removed so long as sealant was properly applied.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;color:#1F497D">Andrew Cabrinovic</span></b><b><span
style="font-family:"Times","serif";color:#1F497D">
</span></b><span style="font-size:10.0pt;color:#1F497D">/ Curator,
Invertebrates Division</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"></span><span
style="font-size:10.0pt;color:#1F497D">/ Dept of Life
Sciences / DC(1) rm505
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D">Natural History
Museum, Cromwell Road, London SW7 5BD, U.K.</span><span
style="font-family:"Times","serif";color:#1F497D">
</span><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>
[<a class="moz-txt-link-freetext" href="mailto:nhcoll-l-bounces@mailman.yale.edu">mailto:nhcoll-l-bounces@mailman.yale.edu</a>]
<b>On Behalf Of </b>Callomon,Paul<br>
<b>Sent:</b> 20 March 2015 19:44<br>
<b>To:</b> Nancy Glover McCartney;
<a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> Re: [Nhcoll-l] old glass containers<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Those are Whittall Tatum jars, made here in
Philadelphia and at least 80 years old. The bigger the size,
the more fragile they are; I have a ten-gallon one that we
handle very carefully indeed.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">The smaller ones are pretty tough, though, and
I’ve used the half-gallon size for years. They are made of
soda glass and will crizzle in time, but are thick enough
that it won’t weaken them significantly.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">You can cut new gaskets from neoprene sheet,
but we make do with archival plastic foam sheet with a thin
film of vacuum grease on both sides. You hand-tighten the
clamp until you see the seal form all round the lid, then
check up on them periodically.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Finally, NEVER carry them by the clamp bow;
always support them underneath.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:black"
lang="EN-US">Paul Callomon</span></b><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:black"
lang="EN-US"><br>
<i>Collection Manager, Malacology, Invertebrate Paleontology
and General Invertebrates</i></span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"
lang="EN-US"><o:p></o:p></span></p>
<div class="MsoNormal"
style="text-align:center;background:white" align="center">
<span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:black"
lang="EN-US">
<hr align="center" size="2" width="100%">
</span></div>
<p class="MsoNormal" style="background:white"><b><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:black"
lang="EN-US">Academy of Natural Sciences of Drexel
University, Philadelphia<o:p></o:p></span></b></p>
<p class="MsoNormal" style="background:white"><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:black"
lang="EN-US">1900 Benjamin Franklin Parkway, Philadelphia PA
19103-1195, USA<br>
<i><a moz-do-not-send="true" href="mailto:callomon@ansp.org" target="_blank">callomon@ansp.org</a> Tel 215-405-5096 -
Fax 215-299-1170</i></span><span
style="font-family:"Calibri","sans-serif";color:black"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US">
<a moz-do-not-send="true" href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>
[<a moz-do-not-send="true" href="mailto:nhcoll-l-bounces@mailman.yale.edu">mailto:nhcoll-l-bounces@mailman.yale.edu</a>]
<b>On Behalf Of </b>Nancy Glover McCartney<br>
<b>Sent:</b> Friday, March 20, 2015 2:55 PM<br>
<b>To:</b> <a moz-do-not-send="true" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> [Nhcoll-l] old glass containers<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US">I
have several old glass containers housing fish, herps,
inverts, etc. that are getting very low on fluid. I
expect the containers are pretty brittle, as a gar
with a giant lobster broke with almost no provocation
and spewed formalin all over: not a process I want to
repeat. I don't have any idea what these specimens
are stored in.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US">I
have attached a few pix of fish and the screw down
tops that appear to have parafilm or an ancient
rubber around the lid; some of the smaller containers
have what may be beeswax holding in a stopper.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US">Should
I attempt to open and replace fluid? If so, how? What
precautions?
<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US">An
earlier query 10 years or so ago said just to leave
them alone, but maybe there is different advice now.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US">I'd
appreciate some doable suggestion.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US">My
thanks in advance, as always.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:black" lang="EN-US">Nancy
Glover McCartney, PhD<br>
Curator of Zoology<br>
UA Collections Facility<br>
120 BIOMASS<br>
University of Arkansas<br>
2435 Hatch<br>
Fayetteville AR 72701<br>
<br>
Phone: 479-575-4370<br>
Fax: 479-575-7464<br>
<br>
<a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__museum.uark.edu_index.php&d=AwMFAw&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=x9k-TlzFJTAsCvPqLBttnPE62-CZDhXIe_QpULlzVAY&s=rMQz_Pq_fBnJQlAvHjK9usJ_CkBwU0Svrpt8DG40zRo&e=">http://museum.uark.edu/index.php</a><o:p></o:p></span></p>
</div>
</div>
</div>
</div>
<br>
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<pre class="moz-signature" cols="72">--
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Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de
Postanschrift:
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