<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Dear James,</p>
<p>to add to Robs very good advice and Chis recommendation of the
glassplate. I recommend you to use a float glass plate (at least
4mm thick) and pour some carborundum (SiC) in 80 & 180 grit,
here is a austrian supplier: <br>
<a class="moz-txt-link-freetext" href="http://www.mineraliengrosshandel.com/Siliciumcarbid-Schleifpulver/Siliziumkarbid-Siliziumcarbid-F-80-1-kg::489.html">http://www.mineraliengrosshandel.com/Siliciumcarbid-Schleifpulver/Siliziumkarbid-Siliziumcarbid-F-80-1-kg::489.html</a>.
<br>
</p>
<p>To start to get all flattened you use the 80 grade and then go to
the 180. This has the advantage that you will have full control of
the jar, since you will be grinding it mechanically with your
hands and not with a machine. I have had the bad experience in the
past, that the lap disc literally took the jar out of my hand and
crushed into pieces. It's way more work and time consuming, but if
you have a steady hand, you will get at least 1-3 mm grinded down
without a problem.<br>
You cant use the float glass for more than 4-5 jars, since it will
get uneven wile grinding it down.<br>
</p>
<p>As a seal I recommend you to use a beeswax/colophony mix (4:1)
and to head the lid at 120°C in an oven. By this you will get a
slight vacuum
in the jar which seals it perfectly and inhibits oxidation. It was
used by the old teaching aid manufacturers back in 1890's and its
a great barrier for ethanol. Silicone will fail since its
permeable to ethanol with the years. <br>
</p>
<p>The only thing is that doing this requires some kind of practice,
so start with some tiny test jars and the go up the scale,
grinding and sealing big jars is a hard task. And use new lids of
at least 4 mm thickness too, these have to be grinded too of
course.</p>
<p>If all fails, there is a putty called "Terostat IX": <br>
<a class="moz-txt-link-freetext" href="https://www.henkel-adhesives.com/ch/de/produkt/flexible-sealants/teroson_rb_ix.html">https://www.henkel-adhesives.com/ch/de/produkt/flexible-sealants/teroson_rb_ix.html</a>
<br>
This can be used with warm lids, so you still get the effect of
the slight vacuum. Its not tested for longevity, but some
colleagues have had no issues since the last 20 years. But its no
conservation product, so just to get this clear ;>)<br>
</p>
<p><br>
</p>
<p>All the best wishes from Switzerland,</p>
<p></p>
<div class="moz-cite-prefix">Am 11.01.23 um 16:45 schrieb Tacker,
Christopher:<br>
</div>
<blockquote type="cite"
cite="mid:DM8PR09MB68405AA63C551719539113848BFC9@DM8PR09MB6840.namprd09.prod.outlook.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255);" dir="auto">
If you choose to grind them flat, the quickest and most
aggressive way to do it is 120 grit on a glass plate. I even got
lucky at the glass business - they had unclaimed thick glass
that they just gave me. This is also fairly cheap in terms of
supplies and time.</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255);" dir="auto">
<br>
</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255);" dir="auto">
You could even get some wet/dry sandpaper at a hardware store. </div>
<div id="ms-outlook-mobile-signature" dir="auto">
<div><br>
</div>
Chris Tacker, Ph.D., P.G.
<div dir="auto">Research Curator of Geology</div>
<div dir="auto">North Carolina Museum of Natural Sciences</div>
<div dir="auto">11 West Jones St. | Raleigh, NC 27601</div>
<div dir="auto"><br>
</div>
<div dir="auto">Emails to and from this address are subject to
NC Public Records Law and may be disclosed to third parties.</div>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
Nhcoll-l <a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l-bounces@mailman.yale.edu"><nhcoll-l-bounces@mailman.yale.edu></a> on behalf
of Robert Waller <a class="moz-txt-link-rfc2396E" href="mailto:rw@protectheritage.com"><rw@protectheritage.com></a><br>
<b>Sent:</b> Wednesday, January 11, 2023 10:32:06 AM<br>
<b>To:</b> James Maclaine <a class="moz-txt-link-rfc2396E" href="mailto:j.maclaine@nhm.ac.uk"><j.maclaine@nhm.ac.uk></a>;
<a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a> <a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l@mailman.yale.edu"><nhcoll-l@mailman.yale.edu></a><br>
<b>Subject:</b> [External] Re: [Nhcoll-l] Putty For Sealing
Jars</font>
<div> </div>
</div>
<style>@font-face
{font-family:"Cambria Math"}@font-face
{font-family:Calibri}p.x_MsoNormal, li.x_MsoNormal, div.x_MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif}a:link, span.x_MsoHyperlink
{color:#0563C1;
text-decoration:underline}span.x_EmailStyle19
{font-family:"Calibri",sans-serif;
color:windowtext}.x_MsoChpDefault
{font-size:10.0pt}div.x_WordSection1
{}</style>
<div link="#0563C1" vlink="#954F72" style="word-wrap:break-word"
lang="EN-US">
<div style="background-color:#FFEB9C; width:100%;
border-style:solid; border-color:#9C6500; border-width:1pt;
padding:2pt; font-size:10pt; line-height:12pt;
font-family:'Calibri'; color:black; text-align:left">
<span style="color:#FF0000; font-weight:bold">CAUTION:</span>
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" style="color:red"
moz-do-not-send="true">Report Spam.</a></div>
<br>
<div>
<div class="x_WordSection1">
<p class="x_MsoNormal"><span lang="EN-CA">Hi James,</span></p>
<p class="x_MsoNormal"><span lang="EN-CA">Not a complete
answer, but something you might want to check on. Your
mineralogy or geology prep labs might have equipment for
grinding perfectly flat surfaces (for them, in advance
of polishing). If so, they could quickly and easily
grind your jar tops flat for you. If they don’t have the
equipment then they may be able to point you to someone
who does. A vibrating lap (<a
href="https://urldefense.com/v3/__https://kingsleynorth.com/16-inch-covington-vibrating-lap.html__;!!HYmSToo!cYC3fw02i6vOpwFSOFOihSZnnAskFr7aSQRQFKPe4wTf_bXCK9J9zyEa81-x2ZLzL2MyX_FWil_yAo8GUzjBjquo0p_uSA$"
moz-do-not-send="true">https://kingsleynorth.com/16-inch-covington-vibrating-lap.html</a>)
might be ideal but even a rotating flat lap (<a
href="https://urldefense.com/v3/__https://arrowheadlapidarysupply.com/products/18-rotating-disc-flat-lap-model-18rl/2695/)*20would__;JQ!!HYmSToo!cYC3fw02i6vOpwFSOFOihSZnnAskFr7aSQRQFKPe4wTf_bXCK9J9zyEa81-x2ZLzL2MyX_FWil_yAo8GUzjBjqvgqfe_0w$"
moz-do-not-send="true">https://arrowheadlapidarysupply.com/products/18-rotating-disc-flat-lap-model-18rl/2695/)</a>
would serve.</span></p>
<p class="x_MsoNormal"><span lang="EN-CA">Whatever you
choose to seal with, the a perfectly flat jar top is
certain to improve the seal.</span></p>
<p class="x_MsoNormal"><span lang="EN-CA">Rob</span></p>
<div>
<div style="border:none; border-top:solid #E1E1E1 1.0pt;
padding:3.0pt 0cm 0cm 0cm">
<p class="x_MsoNormal"><b>From:</b> Nhcoll-l
<a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l-bounces@mailman.yale.edu"><nhcoll-l-bounces@mailman.yale.edu></a> <b>
On Behalf Of </b>James Maclaine<br>
<b>Sent:</b> Wednesday, January 11, 2023 7:09 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a><br>
<b>Subject:</b> [Nhcoll-l] Putty For Sealing Jars</p>
</div>
</div>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal"><span lang="EN-GB">Dear all,</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Happy New Year!</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><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. </span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><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!).
</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><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.</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Any suggestions
would be much appreciated.</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">Cheers,</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB">James</span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
<p class="x_MsoNormal"><span lang="EN-GB"> </span></p>
</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Nhcoll-l mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Nhcoll-l@mailman.yale.edu">Nhcoll-l@mailman.yale.edu</a>
<a class="moz-txt-link-freetext" href="https://mailman.yale.edu/mailman/listinfo/nhcoll-l">https://mailman.yale.edu/mailman/listinfo/nhcoll-l</a>
_______________________________________________
NHCOLL-L is brought to you by the Society for the Preservation of
Natural History Collections (SPNHC), an international society whose
mission is to improve the preservation, conservation and management of
natural history collections to ensure their continuing value to
society. See <a class="moz-txt-link-freetext" href="http://www.spnhc.org">http://www.spnhc.org</a> for membership information.
Advertising on NH-COLL-L is inappropriate.
</pre>
</blockquote>
<div class="moz-signature">-- <br>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<br>
<div class="moz-signature">
<div class="moz-signature">
<div class="moz-signature">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<title></title>
Tel: +49 (0) 1573 2778729
<div class="moz-signature">
<div class="moz-signature"><br>
</div>
<div class="moz-signature">Web:
<a class="moz-txt-link-abbreviated" href="http://www.naturhistorische-konservierung.de">www.naturhistorische-konservierung.de</a><br>
</div>
<div class="moz-signature"><br>
</div>
<img
src="cid:part1.6Py30AMe.PGG7SizX@naturhistorische-konservierung.de"
moz-do-not-send="false" width="496" height="192"> </div>
</div>
</div>
</div>
</div>
</body>
</html>