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<p class="MsoNormal">Brandon<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I know there are better Safety Experts than me, but here is my opinion.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First, I avoid bib-style aprons entirely and only use full-sleeve aprons. Surprisingly, that eliminates MOST available products. It would seem to me most exposure to chemicals will be the chest and arms. Bibs offer marginal protection
to the chest and none to the shoulders and arms. Hence, my focus on full-sleeve aprons. (Sleevelets/arm guards are more trouble than they are worth and still leave the upper arms and shoulders unprotected.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Second, I think the biggest problem with hot phosphoric is the hot part. The apron you reference is a PVC apron. One reference I found shows PVC has good (not excellent) protection for phosphoric acid. However, it also melts at 100°C
and has a maximum operating temperature of 60°C. This will be a problem for most products. Additionally, the thicker the apron, the longer it will hold the heat from a splash, increasing the effect of the thermal burn.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I use Tychem-SL (aka, Tychem 4000) full-sleeve aprons for all my acid/base processing. They provide better resistance to a broader range of chemicals, including phosphoric acid. Unfortunately, I find no information on the melting temperature
of the Saranex 23-P coating on these aprons. There is not a single product that is appropriate for all chemicals and circumstances, but we’ve been pleased with this product as a reasonable compromise – even though it isn’t intended for cleanroom use.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hope this helps a little,<o:p></o:p></p>
<p class="MsoNormal">tonyO<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Tony Olsen<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Nanofab Cleanroom Supervisor/Process Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">University of Utah<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">36 S Wasatch Dr, Suite 2500<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Salt Lake City, UT 84112<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">801-587-0651 office<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">801-587-3077 fax<o:p></o:p></span></p>
<p class="MsoNormal"><a href="http://www.nanofab.utah.edu/"><span style="color:#6666CC">www.nanofab.utah.edu</span></a><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> Brandon Woo <woobc@lnf.umich.edu> <br>
<b>Sent:</b> Wednesday, May 15, 2019 13:41<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Hot Phosphoric PPE<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Does anyone have any recommendations on PPE for processing using hot phosphoric acid?
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This is the apron that we are currently using: <a href="https://www.grainger.com/product/ANSELL-Chemical-Resistant-Bib-Apron-5EMD0">
https://www.grainger.com/product/ANSELL-Chemical-Resistant-Bib-Apron-5EMD0</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Brandon Woo<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Engineer in Research Intermediate<o:p></o:p></p>
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<p class="MsoNormal">Lurie Nanofabrication Facility<o:p></o:p></p>
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<p class="MsoNormal">University of Michigan<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">1234 EECS<o:p></o:p></p>
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<p class="MsoNormal">1301 Beal Ave<o:p></o:p></p>
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<p class="MsoNormal">Ann Arbor, MI, 48105<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="mailto:woobc@lnf.umich.edu" target="_blank">woobc@lnf.umich.edu</a><o:p></o:p></p>
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<p class="MsoNormal">989-324-0620 (C)<o:p></o:p></p>
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