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<div class="moz-cite-prefix">... just to add to Catharine Hawks:<br>
<br>
phenolic plastic is a phenol formaldehyde resin plastic belonging
to the group of thermosetting polymers such as Bakelite. In
general, all plastics based on formaldehyde polymers / using
formaldehyde for condensation of the polymer chains have issues if
coming into secondary contact with free formaldehyde after
polymerisation, which induces breaking of polymer chains. In
specimen jars with (initially) formalin fixed material this may be
leaking residual formalin escaping from specimens, as Catharine
already said. <br>
<br>
All plastics belonging to this group of thermosetting polymers
should be avoided in (wet) collections. If plastic can be avoided,
LDPE / HDPE (= Low/High Density Polyethylen) should be preferred,
as PE-Plastic are the most stable plastics we have for collections
(Polypropylene & PVC may also cause issues depending on how
the collection is / has to be maintained).<br>
<br>
All the best<br>
Dirk <br>
<br>
<br>
<br>
Am 16.06.2014 01:26, schrieb <a class="moz-txt-link-abbreviated" href="mailto:CAHawks@aol.com">CAHawks@aol.com</a>:<br>
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<div>One problem with phenolic caps is that the polymer probably
contains formaldehyde. Exposed to trace formaldehyde from
fixation of specimens subsequently stored in alcohol, the
polymer will deteriorate (that old, "like dissolves like"
concept). Any specimen fixed in formalin and later transferred
to alcohol should have some unfixed formaldehyde in the
alcohol given that fixation is a equilibrium reaction. </div>
<div> </div>
<div>Cathy</div>
<div> </div>
<div><font family="SANSSERIF" ptsize="10" size="2" face="Arial"
lang="0">Catharine Hawks, PA-AIC, FIIC<br>
Conservator, NMNH<br>
(h) 703.876.9176<br>
(o) 202.633.0835<br>
mobile 703.200.4370<br>
moblile 202.701.8458<br>
<a class="moz-txt-link-abbreviated" href="mailto:hawksc@si.edu">hawksc@si.edu</a> <br>
<br>
<div> </div>
<div>
<div>In a message dated 6/13/2014 5:22:28 P.M. Eastern
Daylight Time, <a class="moz-txt-link-abbreviated" href="mailto:halford@sfu.ca">halford@sfu.ca</a> writes:</div>
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<div>When phenolic capped vials are stored as you
describe the caps can expand over time and
eventually fall off, potentially leading to lots
becoming mixed in the bottom of the holding
vessel. It's better to discard the cap and
replace it with a loose plug of cotton. Face the
neck of the vial up so no air bubbles become
trapped.<br>
<br>
</div>
Steve.<br>
</div>
<div class="gmail_extra"><br clear="all">
<div>
<div dir="ltr">Steve Halford (<a
moz-do-not-send="true"
title="mailto:halford@sfu.ca"
href="mailto:halford@sfu.ca" target="_blank">halford@sfu.ca</a>)<br>
Museum Technician (Retired) <br>
Department of Biological Sciences<br>
Simon Fraser University<br>
<br>
</div>
</div>
<br>
<br>
<div class="gmail_quote">On Fri, Jun 13, 2014 at
10:28 AM, Callomon,Paul <span dir="ltr"><<a
moz-do-not-send="true"
title="mailto:prc44@drexel.edu"
href="mailto:prc44@drexel.edu" target="_blank">prc44@drexel.edu</a>></span>
wrote:<br>
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style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px
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<p class="MsoNormal">Folks,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">We have noticed that in
cases where a phenolic resin cap is
immersed in alcohol (70-80% ethanol) for
long periods (such as when a vial with a
sample is included in a larger
alcohol-preserved lot) the alcohol becomes
discolored. I presume the resin is
leaching something. Does anyone know of
any published work on this?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="BACKGROUND:
white"><b><span style="FONT-SIZE: 10pt;
COLOR: black">Paul Callomon</span></b><span
style="FONT-SIZE: 10pt; COLOR: black"><br>
<i>Collection Manager, Malacology,
Invertebrate Paleontology and General
Invertebrates</i></span><span
style="COLOR: black"></span></p>
<div class="MsoNormal" style="BACKGROUND:
white; TEXT-ALIGN: center" align="center"><span
style="FONT-SIZE: 10pt; COLOR: black">
<hr size="2" width="100%" align="center">
</span></div>
<p class="MsoNormal" style="BACKGROUND:
white"><b><span style="FONT-SIZE: 10pt;
COLOR: black">Academy of Natural
Sciences of Drexel University,
Philadelphia</span></b><b><span
style="FONT-SIZE: 10pt; COLOR: black"></span></b></p>
<p class="MsoNormal" style="BACKGROUND:
white"><span style="FONT-SIZE: 10pt;
COLOR: black">1900 Benjamin Franklin
Parkway, Philadelphia PA 19103-1195, USA</span><span
style="FONT-SIZE: 10pt; COLOR: black"><br>
<i><a moz-do-not-send="true"
title="mailto:callomon@ansp.org"
href="mailto:callomon@ansp.org"
target="_blank"><span style="COLOR:
blue">callomon@ansp.org</span></a>
Tel <a moz-do-not-send="true"
title="tel:215-405-5096"
href="tel:215-405-5096"
target="_blank" value="+12154055096">215-405-5096</a>
- Fax <a moz-do-not-send="true"
title="tel:215-299-1170"
href="tel:215-299-1170"
target="_blank" value="+12152991170">215-299-1170</a></i></span><span
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<pre class="moz-signature" cols="72">--
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de
Postanschrift:
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Besuchen Sie unsere Sammlung:
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---------
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Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de
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