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<div class="moz-cite-prefix">just to add to Paul's comment:<br>
<br>
same applies to (kautex) wide neck plastic bottles:
<a class="moz-txt-link-freetext" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.fisher.co.uk_1_1_210583-2Dcontainer-2Dsquare-2Dwide-2Dneck-2Dpvc-2Dcrystal-2Dclear-2Dseries-2D200ml.html&d=AwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=Ji7L_taUrYr4MdLeLHIKOBUXcCuEEEbc8h8h51zTu4M&s=kj75ONINNLrSb5tqzNNuX14dEkM7R-kghMI-mSZdcjg&e=">http://www.fisher.co.uk/1/1/210583-container-square-wide-neck-pvc-crystal-clear-series-200ml.html</a><br>
<br>
These containers are used in some herpetology collections, but
over time the plastic gets brittle and cracks, same applies to the
lids. Both, Bakelite and phenolic resins are phenol formaldehyde
resins and share the same CAS-number. The problem is the exposure
to formaldehyde gas in the long run (any residual formalin trapped
inside the specimen container, e.g. tiny amounts dissolving from
specimens) which changes the (chemical) structure of the plastic.<br>
<br>
Dirk<br>
<br>
<br>
Am 01.11.2015 um 18:47 schrieb Callomon,Paul:<br>
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cite="mid:C1E962B15D943F4F8815E5E9BBA103A9F4551252@MB4.drexel.edu"
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<div style="direction: ltr;font-family: Tahoma;color:
#000000;font-size: 10pt;">Following Dirk's comments on Bakelite:
a distinction should be drawn between Bakelite and phenolic
resin. The former uses wood dust as a filler, and is not stable
under mechanical stress (such as in a screw top) for long
periods. Phenolic, however, seems (from our sampling of
50-year-old-plus bottles) to be very stable, showing no
micro-cracking or other stress symptoms. However, as Dirk points
out, neither material should be exposed to Formalin vapor or
submerged in preservative. If (as was previously done in our
collection) submerged internal vials are capped with phenolic
lids, the latter will stain the alcohol even if Formalin was
never present.
<br>
<br>
<div><b>Paul Callomon</b><br>
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px"><i>Collection
Manager, Malacology, Invertebrate Paleontology and
General Invertebrates</i><br>
<hr>
<font face="Verdana"><b>Academy of Natural Sciences of
Drexel University, Philadelphia</b></font><br>
<i><a class="moz-txt-link-abbreviated" href="mailto:callomon@ansp.org">callomon@ansp.org</a> Tel 215-405-5096 - Fax 215-299-1170</i><br>
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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:
Staatliche Naturwissenschaftliche Sammlungen Bayerns
Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Labor
Münchhausenstr. 21
81247 München
Besuchen Sie unsere Sammlung:
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---------
Dirk Neumann
Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de
postal address:
Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Lab
Muenchhausenstr. 21
81247 Munich (Germany)
Visit our section at:
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