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<div class="moz-cite-prefix">Dear Simon, dear all,</div>
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<div class="moz-cite-prefix">well yes, surely more expensive in the
first place, but pays off in the long run as it makes a good seal
and reduces monitoring and maintenance needs. Alsirol can easily
be wiped off with toilet paper if you need to replace the seal
(while old vaseline usually require cleaning under hot water with
a good fat-dissolving detergent). No backing for nearly 20 years
in our collections, even though very sceptical in the beginning
because of the small 50 ml jars. By replacing the vaseline, we
were able the tackle the frequent need to open (oxygen influx) top
up (altering the reached chemical equilibrium of the holding
fluid) and renew seals on the (large) historic and uneven battery
jars in our collection (containing oily sharks and rays).</div>
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<div class="moz-cite-prefix">A lot of advantages, I am quite happy
with it, but of course there are other alternatives with similar
good results, but I would always prefer silicone-free grease.
There surely are high-quality silicone greases, but the cons
outweigh the pros. For example, silicones in general tend to
harden over time, they are not a good oxygen barrier and it
usually needs special chemical cleaners to remove the silicone
film again (those who ever glued own aquarium tanks know the pain
...).<br>
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<div class="moz-cite-prefix">With best wishes</div>
<div class="moz-cite-prefix">Dirk<br>
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<div class="moz-cite-prefix">Am 27.02.2020 um 16:33 schrieb Simon
Moore:<br>
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cite="mid:49571D20-65C4-4A1F-B81B-A9DDBD8D7270@btinternet.com">
<pre class="moz-quote-pre" wrap="">Thanks Dirk,
I have also had problems with older versions of Vaseline (1970s) where the dehydrating effect of IMS / IDA alcohols produced little tiny coagulated ‘pills’ of vaseline in the sealed area, whereas Paraffin soft white (a similar product) was fine and didn’t do this. The Alsirol I have used to good effect thus far for at least 7 years but some say it’s quite expensive at E33 per 50ml tub; however, as Dirk suggested, you do only need a thin smear to seal a jar effectively. To that end you only need a small amount of any of the greasy sealants - too much and they gradually flow down into the jar and the lid can ‘float’ on the excess sealant.
With all good wishes, Simon.
Simon Moore MIScT, RSci, FLS, ACR
Conservator of Natural Sciences and Cutlery Historian,
<a class="moz-txt-link-abbreviated" href="http://www.natural-history-conservation.com">www.natural-history-conservation.com</a>
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">On 27 Feb 2020, at 14:47, Dirk Neumann <a class="moz-txt-link-rfc2396E" href="mailto:neumann@snsb.de"><neumann@snsb.de></a> wrote:
Hi Esther,
vaseline has few disadvantages
1. it tends to flow inside the jar (especially if you need to close uneven battery jars etc. with increased amounts of vaseline to produce a proper seal)
2. it tends to attract additional moisture evaporating from inside the jar (turning the jelly glossy - usually a good indicator when it slowly starts running)
3. it sometimes may get backed (might be linked with low RH values inside storage).
We changed around 2000 to a silicon-free vacuum joint grease called Alsirol with good results. It is produced from a small company in Bamberg, Germany and formerly was also distributed (at least in Germany) via VWR, FisherScientific apparently is also offering it
<a class="moz-txt-link-freetext" href="https://www.fishersci.de/shop/products/joint-grease-1/10130201">https://www.fishersci.de/shop/products/joint-grease-1/10130201</a>
But you can also contact and order directly <a class="moz-txt-link-freetext" href="http://www.poellath-labor.de/">http://www.poellath-labor.de/</a>
The containers are rather small (only 50 ml), but Alsirol is very economic and you only need little to produce a proper closure (too much in fact even is disadvantageous). As it is very greasy and stable, it is possible to build it up on uneven flanges or battery jars.
Hope this helps, with best wishes
Dirk
Am 27.02.2020 um 15:32 schrieb Esther Dondorp:
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<pre class="moz-quote-pre" wrap="">Dear all,
Just a short question - we always use vaseline to seal gound jar stoppers, now that we cannot use our old supplier anymore the support department ordered the commercial vaseline petroleum jelly like this one. I was wondering if we can use it or that it has additional additives that can effect the balance inside the jar. Is there an acid free or other alternative? Wondering what other people use!
Many thanks,
Esther Dondorp
Senior Collectiebeheerder
+31717519313 - -
<a class="moz-txt-link-abbreviated" href="mailto:esther.dondorp@naturalis.nl">esther.dondorp@naturalis.nl</a> - <a class="moz-txt-link-abbreviated" href="http://www.naturalis.nl">www.naturalis.nl</a>
Darwinweg 2, 2333 CR Leiden
Postbus 9517, 2300 RA Leiden
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<pre class="moz-quote-pre" wrap="">
--
<ihicmjhhgakhnelo.png>
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
neumann(a)snsb.de
Postanschrift:
Staatliche Naturwissenschaftliche Sammlungen Bayerns
Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Storage
Münchhausenstr. 21
81247 München
Besuchen Sie unsere Sammlung:
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a>
---------
Dirk Neumann
Tel: +49-89-8107-111
Fax: +49-89-8107-300
neumann(a)snsb.de
postal address:
Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Storage
Muenchhausenstr. 21
81247 Munich (Germany)
Visit our section at:
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a>
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_______________________________________________
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>
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<pre class="moz-quote-pre" wrap="">
</pre>
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<p><br>
</p>
<div class="moz-signature">-- <br>
<p><img src="cid:part1.4EB6B8B5.F830A754@snsb.de" alt=""
width="152" height="59"></p>
<p><br>
Dirk Neumann<br>
<br>
Tel: 089 / 8107-111<br>
Fax: 089 / 8107-300<br>
neumann(a)snsb.de<br>
<br>
Postanschrift:<br>
<br>
Staatliche Naturwissenschaftliche Sammlungen Bayerns<br>
Zoologische Staatssammlung München<br>
Dirk Neumann, Sektion Ichthyologie / DNA-Storage<br>
Münchhausenstr. 21<br>
81247 München<br>
<br>
Besuchen Sie unsere Sammlung:<br>
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><br>
<br>
---------<br>
<br>
Dirk Neumann<br>
<br>
Tel: +49-89-8107-111<br>
Fax: +49-89-8107-300<br>
neumann(a)snsb.de<br>
<br>
postal address:<br>
<br>
Bavarian Natural History Collections<br>
The Bavarian State Collection of Zoology<br>
Dirk Neumann, Section Ichthyology / DNA-Storage<br>
Muenchhausenstr. 21<br>
81247 Munich (Germany)<br>
<br>
Visit our section at:<br>
<a class="moz-txt-link-freetext" href="http://www.zsm.mwn.de/sektion/ichthyologie-home/">http://www.zsm.mwn.de/sektion/ichthyologie-home/</a><br>
<br>
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