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<p class="MsoNormal"><span style="color:#1F497D">Paul,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">At the Canadian Museum of Nature, we have been using F217 PE Seals for a good 20 years and have not observed deterioration. This is not to say that we have checked all lids with such gaskets installed since that
time, but we have had the opportunity to open quite a few.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">As Stott Williams indicated, there may certainly be differences between batches, as it’s been for instance observed for batches of Ethafoam and other closed-cell polyethylene products.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">While it is still hard to predict the long-term durability of PE seal, the use of a good sealing tape around the lid can certainly serve to at least partly mitigate this problem and insure the preservation of
the collection specimens (Steigerwald, Michele and Sylvie Laframboise, 1996. Tape application: a jar sealing method for reducing ethanol evaporation in fluid-preserved collections.
<i>Collection Forum</i> 12(2): 45-53).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Jean-Marc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="FR-CA" style="font-size:8.5pt;font-family:"Arial","sans-serif";color:#1F497D">Jean-Marc Gagnon</span><b><span lang="FR-CA" style="font-size:8.5pt;font-family:"Arial","sans-serif";color:green">,
</span></b><b><span lang="FR-CA" style="font-size:6.0pt;font-family:"Arial","sans-serif";color:green">Ph.D.</span></b><b><span lang="FR-CA" style="font-size:6.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">Past President (2012-2014) of the Society for the Preservation of Natural History Collections (</span></i><i><span lang="FR-CA" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green"><a href="http://www.spnhc.org/"><span lang="EN-CA">www.spnhc.org</span></a></span></i><i><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">)
</span></i><i><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">Curator / Conservateur des collections</span><span lang="FR-CA" style="color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">Invertebrate Collections / Collections des invertébrés</span><span lang="FR-CA" style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">Canadian Museum of Nature / Musée canadien de la nature</span><span lang="FR-CA" style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">P.O. Box 3443, Stn "D" / C.P. 3443, Succ. D</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">Ottawa, ON Canada K1P 6P4</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:green">T: 613-364-4066 / F: 613-364-4027</span><span lang="FR-CA" style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:9.0pt;font-family:"Arial","sans-serif";color:green">E/C:
<a href="mailto:jmgagnon@mus-nature.ca"><span style="font-size:7.5pt">jmgagnon@mus-nature.ca</span></a></span><span lang="FR-CA" style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:9.0pt;font-family:"Arial","sans-serif";color:navy"><a href="http://www.nature.ca/"><span lang="EN-US" style="font-size:7.5pt;color:green">http://www.nature.ca</span></a></span><span lang="FR-CA" style="font-size:12.0pt;font-family:"Times New Roman","serif";color:green"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> nhcoll-l-bounces@mailman.yale.edu [mailto:nhcoll-l-bounces@mailman.yale.edu]
<b>On Behalf Of </b>Paul Callomon<br>
<b>Sent:</b> July-30-12 3:56 PM<br>
<b>To:</b> NH-COLL listserv (nhcoll-l@mailman.yale.edu)<br>
<b>Subject:</b> [Nhcoll-l] Potential problem with older PE jar lid liners<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Colleagues,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have today found a severely deteriorated jar lid liner in our alcohol collection. The liner is made from polyethylene foam. It was sold to us in 1999 and installed in 2000. The material has failed completely, with crazing
and cracking of the surface and tearing along the compression face. The foam has become weak and powdery in places. The jar was filled with 70% ethanol.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The manufacturers have suggested that the use of this liner for long-term storage of alcohol is responsible for the deterioration. If this is true, the implications for our collection – we have about 20,000 bottles that
use these liners – are potentially serious. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Does anyone have experience with this problem? Are Teflon liners a better alternative?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif"">Paul Callomon<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif"">Collections Manager in Malacology, Invertebrate Paleontology and General Invertebrates<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-top:4.0pt"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif";font-variant:small-caps">The Academy of Natural Sciences of Drexel University<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif"">1900 Benjamin Franklin Parkway<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif"">Philadelphia, PA 19103<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif""><a href="mailto:callomon@ansp.org">callomon@ansp.org</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif"">Tel. 215-405-5096<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif"">ansp.org<o:p></o:p></span></p>
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