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<div class="moz-cite-prefix">Hi Tonya,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">maybe two things to consider here: PTFE
is rather inert (stable against ethanol and formalin) and a good
oxygen barrier; some collections in Europe use PFTE liners that
are sold by a Swiss based vendor. The key question for me would be
how thick the liner (?) is; PTFE can be a good gasket, if thick
enough (i.e. > 0.2 mm) to avoid damages from compression /
repeated opening & closing.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">The more relevant question for me would
be the lid material itself; if the PTFE liner should be used with
metal lids, it still might trap some vapours and moisture between
lid and fluid if it is a PTFE inlay or (extra) internal gasket
inside screw-on lids; this could trigger corrosion of the lids -
besides all good properties of the PTFE. So good quality HDPE or
PP plastic lids might be a better choice. Besides all this, I
would strongly recommend to look into standardised lid sizes -
this is surely one of the main lessons that can and should be
learnt from the famous Copenhagen jars: in many fluid collections,
the lids approach the end of their life span, but can't be
replaced easily because they were not standardised and the
original producer is no longer available. Standardised lids are
easy to maintain and cost and time efficient if they have to be
replaced.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Hope this helps,</div>
<div class="moz-cite-prefix">with best wishes to the other side of
the globe<br>
</div>
<div class="moz-cite-prefix">Dirk<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Am 21.05.2020 um 04:51 schrieb Haff,
Tonya (NCMI, Crace):<br>
</div>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I wonder if you all could please give me
your opinion on the use and archival nature of PTFE plastic?
It is in the lids of some jars we are considering purchasing
for use in our EtOH collection, and I see that it is used with
chemicals and in scientific settings, but I have not yet heard
of it used in a museum setting. Any advice or thoughts would
be appreciated!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tonya<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">---------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Dr
Tonya Haff<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Collections
Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Australian
National Wildlife Collection<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">National
Research Collections Australia, CSIRO<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Canberra,
Australia
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Phone:
(+61) 02 6242 1566 (office)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">(+61)
0419 569 109 (mobile)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">I
am in Thursdays and Fridays
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Please
call or text my mobile for a fast reponse Monday – Wednesday<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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