<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
</head>
<body>
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif;" dir="ltr">
<p>Silicon rubbers swell in low and non-polar solvents and its vapors. At a molecular level silicon rubbers exhibit a high segmental mobility resulting in a relatively high permeability. These papers might be of interest to understand the mechanism of action:</p>
<p><br>
</p>
<p><a href="https://pubs.rsc.org/en/content/articlehtml/2015/tc/c5tc01927c" class="OWAAutoLink" id="LPlnk380032" previewremoved="true">https://pubs.rsc.org/en/content/articlehtml/2015/tc/c5tc01927c</a><br>
</p>
<p><br>
</p>
<p><a href="https://www.researchgate.net/publication/319043965_THE_INTERACTIONS_OF_PRESERVATIVE_FLUID_SPECIMEN_CONTAINER_AND_SEALANT_IN_A_FLUID_COLLECTION" class="OWAAutoLink" id="LPlnk630717" previewremoved="true">https://www.researchgate.net/publication/319043965_THE_INTERACTIONS_OF_PRESERVATIVE_FLUID_SPECIMEN_CONTAINER_AND_SEALANT_IN_A_FLUID_COLLECTION</a><br>
</p>
<p><br>
</p>
<p>Kind regards,</p>
<p><br>
</p>
<p>Dries</p>
<p><br>
</p>
<div id="Signature">
<div id="divtagdefaultwrapper" dir="ltr" style="font-size: 12pt; color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-serif, "EmojiFont", "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols;">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="NL"><a href="http://www.linkedin.com/in/andriesvandam" class="OWAAutoLink" id="LPNoLP">Andries J. van Dam</a> | curator-conservator<span style="color:#FF8000"></span></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="NL"> </span></p>
<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="NL"><a href="https://www.lumc.nl/onderwijs/over-ons/anatomisch-museum/?setlanguage=English&setcountry=en" class="OWAAutoLink" id="LPNoLP">Anatomical Museum</a> | Leiden
University Medical Center | Building 3 (V</span><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="EN-US">3-32)</span></p>
<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="EN-US">P.O.Box 9600 | 2300 RC Leiden | The Netherlands</span></p>
<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="EN-US">Visiting address: Hippocratespad 21 | Tel: +31 (0)71 52 68356 | E-mail:
</span><span style=""><a href="https://mail.lumc.nl/owa/redir.aspx?C=O7wgy__4qEq-bCzDQhMP7IpMG33lsdEIUTcpXTatWwljNFWdpbtnBKj-HeYnbumJrkd3hILExAk.&URL=mailto%3aA.J.van_Dam%40lumc.nl" target="_blank" id="LPNoLP"><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"; color:blue" lang="EN-US">A.J.van_Dam@lumc.nl</span></a></span><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="EN-US"></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:8pt; font-family:Verdana,sans-serif" lang="EN-US">Scientific associate</span><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"" lang="EN-US"> | Natural History Museum London |
</span><span style=""><span style="font-size:8.0pt; font-family:"Verdana","sans-serif"; color:blue" lang="EN-US"><a href="https://mail.lumc.nl/owa/redir.aspx?C=O7wgy__4qEq-bCzDQhMP7IpMG33lsdEIUTcpXTatWwljNFWdpbtnBKj-HeYnbumJrkd3hILExAk.&URL=http%3a%2f%2fwww.nhm.ac.uk%2f" target="_blank" id="LPNoLP">http://www.nhm.ac.uk</a></span></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Van:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> namens William Poly <wpoly@calacademy.org><br>
<b>Verzonden:</b> donderdag 18 november 2021 23:20:39<br>
<b>Aan:</b> Callomon,Paul<br>
<b>CC:</b> NHCOLL-new<br>
<b>Onderwerp:</b> [MOGELIJK SPAM ! ******] Re: [Nhcoll-l] [Spam] Re: vials for storing insects in ETOH</font>
<div> </div>
</div>
<div>
<div dir="ltr">
<div>I've also observed the swelling of the green and gray rubber stoppers that Doug mentioned. The swelling is inside the vial where the stopper contacts the ethanol. Could be the denaturants reacting with the rubber (not sure of the exact composition of
these rubber stoppers). Of course the entire stopper will swell if immersed completely in a larger container. Swelling on both ends of the stopper could crack the neck of the vial[?].<br>
</div>
<div><br>
</div>
<div>As an alternate method of relieving pressure (instead of using hypodermic needles), one can use a dissecting probe and release pressure on the side of the rubber stopper (if the vials aren't too fragile); it's worked for me and others.</div>
<div><br>
</div>
<div>Bill</div>
<div></div>
<div>
<div><br>
</div>
<div>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><span style="font-size:12pt;font-family:"Times New Roman","serif";color:green">William J. Poly</span></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><span style="font-size:12pt;font-family:"Times New Roman","serif";color:gray">Research Associate</span></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><span style="font-size:12pt;font-family:"Times New Roman","serif";color:gray">Department of Ichthyology</span></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><span style="font-size:12pt;font-family:"Times New Roman","serif";color:gray">California Academy of Sciences</span></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><span style="font-size:12pt;font-family:"Times New Roman","serif";color:gray">55 Music Concourse Drive, Golden Gate Park</span></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><span style="font-size:12pt;font-family:"Times New Roman","serif";color:gray">San Francisco, California 94118</span></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><span style="font-size:12pt;font-family:"Times New Roman","serif";color:blue"><a href="mailto:wpoly@calacademy.org" target="_blank"><span style="color:blue">wpoly@calacademy.org</span></a></span></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:"Calibri","sans-serif"">
<b><u><span style="font-size:12pt;font-family:"Times New Roman","serif";color:blue"><a href="https://www.calacademy.org/scientists/ichthyology/wpoly" target="_blank"><span style="color:blue">https://www.calacademy.org/scientists/ichthyology/wpoly</span></a></span></u></b><span><span></span></span></p>
<p class="MsoNormal" style="margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:"Calibri","sans-serif"">
<span style="font-size:12pt;line-height:115%;font-family:"Times New Roman","serif""><span> </span></span></p>
</div>
</div>
<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Nov 18, 2021 at 8:51 AM Callomon,Paul <<a href="mailto:prc44@drexel.edu" target="_blank">prc44@drexel.edu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Just some additional thoughts to what everyone else has said:<br>
<br>
- We have found that phenolic resin (the smooth, hard black resin used to make screw tops for smaller vials such as 4- or 6-dram ones, usually with foil or cone-seal liners) is not stable in ethanol; it leaches a brown stain into the fluid within a couple of
years.<br>
- We use small glass "micro-vials" in our dry and wet collections. In alcohol, we stopper them with natural cotton wool. This is finer than polyester batting and thus less likely to snag the specimen; if the plug is made by first rolling the wool into a sausage
and then folding it double and pushing the butt end into the vial opening (like a Kielbasa, extending the metaphor) there are few open fibers facing the specimen. Rehousing some 1850s lots recently gave me a chance to test the cotton for strength and confirmed
that it is effectively inert in alcohol, though not in air. See <a href="https://avanan.url-protection.com/v1/url?o=https%3A//www.researchgate.net/publication/308079611_An_alternative_to_gelatin_capsules_in_natural_history_collections&g=ZjBjOTg5ZTY2Mzg2NGQzNQ==&h=ODY1ODc4MTRhYjY1NDYzOGY2YTdjODc1NzQxNjFjMDEzNGJlMGMwMmY5NWZiYjYzYzk1ZjI2N2YyMmM4N2ZmNQ==&p=YXAzOmNhbGFjYWRlbXk6YXZhbmFuOmc6OTJjMTkyY2QxYmNiNzk5MTU2NDk3ZGVjNzVhOTg4ZjU6djE6cA==" rel="noreferrer" target="_blank">
https://avanan.url-protection.com/v1/url?o=https%3A//www.researchgate.net/publication/308079611_An_alternative_to_gelatin_capsules_in_natural_history_collections&g=ZjBjOTg5ZTY2Mzg2NGQzNQ==&h=ODY1ODc4MTRhYjY1NDYzOGY2YTdjODc1NzQxNjFjMDEzNGJlMGMwMmY5NWZiYjYzYzk1ZjI2N2YyMmM4N2ZmNQ==&p=YXAzOmNhbGFjYWRlbXk6YXZhbmFuOmc6OTJjMTkyY2QxYmNiNzk5MTU2NDk3ZGVjNzVhOTg4ZjU6djE6cA==</a><br>
Given that a vial is going to be submerged in ethanol, though, maybe one could use rolled paper as a stopper - perfectly stable, very cheap. Lollipop sticks (Chupa-chups and the like) are just rolled white paper, and expand slightly when wet - sliced up, they
might make great micro-vial stoppers. <br>
- We used to keep multiple lots in common jars, as Tonya proposed, and still don't automatically counsel against it. There are economic advantages in terms of space and material costs and the time-saving element of only having to check one lid for dozens of
specimens, but there might be long-term issues with sharing fluid via permeable internal barriers, such as the migration of lipids, radio-isotopes and even DNA between lots that could one day give a false signal in analysis. Placing multiple lots in a common
jar but giving each one an impermeable stopper keeps them separate and means that the surrounding fluid is simply a secondary safety measure in case the internal stoppers fail. However, the stability in ethanol of any post-1980s plastic compound across museum-scale
time periods is still not guaranteed. <br>
<br>
<br>
Paul Callomon<br>
Collection Manager, Malacology and General Invertebrates<br>
<br>
Academy of Natural Sciences of Drexel University<br>
1900 Benjamin Franklin Parkway, Philadelphia PA 19103-1195, USA<br>
<a href="mailto:prc44@drexel.edu" target="_blank">prc44@drexel.edu</a> Tel 215-405-5096 - Fax 215-299-1170<br>
<br>
<br>
_______________________________________________<br>
Nhcoll-l mailing list<br>
<a href="mailto:Nhcoll-l@mailman.yale.edu" target="_blank">Nhcoll-l@mailman.yale.edu</a><br>
<a href="https://avanan.url-protection.com/v1/url?o=https%3A//mailman.yale.edu/mailman/listinfo/nhcoll-l&g=NmYyYjQyNTgwNjI5YmZlYg==&h=NDA2MDliOWY4NGNmNTM5ODkwMTU3NjY0MDdjNzAyNDE4MGY5ZThlYjc5MWMyNjA3YWU2ZDdiZWEyM2FiMjU4MA==&p=YXAzOmNhbGFjYWRlbXk6YXZhbmFuOmc6OTJjMTkyY2QxYmNiNzk5MTU2NDk3ZGVjNzVhOTg4ZjU6djE6cA==" rel="noreferrer" target="_blank">https://avanan.url-protection.com/v1/url?o=https%3A//mailman.yale.edu/mailman/listinfo/nhcoll-l&g=NmYyYjQyNTgwNjI5YmZlYg==&h=NDA2MDliOWY4NGNmNTM5ODkwMTU3NjY0MDdjNzAyNDE4MGY5ZThlYjc5MWMyNjA3YWU2ZDdiZWEyM2FiMjU4MA==&p=YXAzOmNhbGFjYWRlbXk6YXZhbmFuOmc6OTJjMTkyY2QxYmNiNzk5MTU2NDk3ZGVjNzVhOTg4ZjU6djE6cA==</a><br>
<br>
_______________________________________________<br>
NHCOLL-L is brought to you by the Society for the Preservation of<br>
Natural History Collections (SPNHC), an international society whose<br>
mission is to improve the preservation, conservation and management of<br>
natural history collections to ensure their continuing value to<br>
society. See <a href="https://avanan.url-protection.com/v1/url?o=http%3A//www.spnhc.org&g=ZmFmNGZjMjZlZjExN2M0OA==&h=MzYxMGQ0ZjUzOWFlODBhNzg2MWIwNzBhNDM2OTc1MDFlODFlNGE0OGJlOGExOGE3ZDRlMmYxNzQ0OTc4ZDM5Zg==&p=YXAzOmNhbGFjYWRlbXk6YXZhbmFuOmc6OTJjMTkyY2QxYmNiNzk5MTU2NDk3ZGVjNzVhOTg4ZjU6djE6cA==" rel="noreferrer" target="_blank">
https://avanan.url-protection.com/v1/url?o=http%3A//www.spnhc.org&g=ZmFmNGZjMjZlZjExN2M0OA==&h=MzYxMGQ0ZjUzOWFlODBhNzg2MWIwNzBhNDM2OTc1MDFlODFlNGE0OGJlOGExOGE3ZDRlMmYxNzQ0OTc4ZDM5Zg==&p=YXAzOmNhbGFjYWRlbXk6YXZhbmFuOmc6OTJjMTkyY2QxYmNiNzk5MTU2NDk3ZGVjNzVhOTg4ZjU6djE6cA==</a>
for membership information.<br>
Advertising on NH-COLL-L is inappropriate.<br>
</blockquote>
</div>
</div>
</body>
</html>