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Dear Matthieu --<br>
<br>
When the Stanford Nanofab underwent renovations in 2012, the
Stanford Fire Marshall gave us a copy of a report from 1993 which
was a comprehensive code study plan for the proposed Annex to our
building. It's a long document, but in it, there was a question
from the Fire Marshall (the County FM, I believe) as to whether
piranha should be considered a Class 3 oxidizer, subject to the
restriction of a four pound maximum limit in open use (i.e., much
less than used in a piranha bath.) Although it is common practice
to use piranha in open baths with appropriate engineering controls,
I gather that the code analysis to substantiate its safe use in this
manner was not easy to find. So Stanford commissioned a third-party
consultant, specializing in environmental safety, to examine this.<br>
<br>
The consultant did an analysis of the chemistry of piranha clean
solutions at temperature and concluded that the oxidizing hazard (as
measured by peroxide concentration) presented was actually much less
than 30% hydrogen peroxide solution which is considered a Class 2
oxidizer. So, now in our Chemtracker database, piranha is now
listed as a Class 2 oxidizer. Nanostrip is no longer in the
database, but was also classified as a Class 2 oxidizer for the same
reasons.<br>
<br>
We have also run into limits on storage. If you have a sprinklered
storage area, you local codes might be more generous with storage
limits.<br>
<br>
Mary<br>
<br>
<pre class="moz-signature" cols="72">--
Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
Paul G. Allen Bldg 141, Mail Code 4070
Stanford, CA 94305
(650)723-9980
<a class="moz-txt-link-abbreviated" href="mailto:mtang@stanford.edu">mtang@stanford.edu</a>
<a class="moz-txt-link-freetext" href="http://snf.stanford.edu">http://snf.stanford.edu</a>
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<br>
<div class="moz-cite-prefix">On 5/25/2015 11:41 AM, Matthieu
Nannini, Dr. wrote:<br>
</div>
<blockquote
cite="mid:886108CD-1C89-4CE5-8BC0-FD7EDE3E83C9@mcgill.ca"
type="cite">
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Colleagues,
<div><br>
</div>
<div>My facilities dept. has classified Nanostrip being oxidizing
liquid class 3 ( MSDS says NPFA rating are H3, F0, R2 and <a
moz-do-not-send="true"
href="https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB0QFjAA&url=https://louisville.edu/micronano/files/documents/safety-data-sheets-sds/NanoStripNanoStripHP.pdf&ei=7WtjVcTmNor5yATCroIY&usg=AFQjCNEeO8g9jAd3aAv18JppQhfOlLj5Iw&sig2=FdxijnVqe4faJw5xZFAOaA">this</a> says
oxidizing liquid category 3).</div>
<div>NPFA 5000 and 400 recommend no more that 2 lbs in use and 20
lbs in storage if in cabinet. Obviously we are over since one 1
Gal container of nanostrip is about 15 lbs.</div>
<div><br>
</div>
<div>Does someone has the same issue ?</div>
<div><br>
</div>
<div>Thanks</div>
<div><br>
</div>
<div>Matthieu</div>
<br>
<br>
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<div style="word-wrap: break-word; -webkit-nbsp-mode:
space; -webkit-line-break: after-white-space; ">
-----------------------------------
<div>Matthieu Nannini<br>
McGill Nanotools Microfab<br>
Manager<br>
t: 514 398 3310<br>
c: 514 758 3311<br>
f: 514 398 8434<br>
<a moz-do-not-send="true"
href="http://mnm.physics.mcgill.ca/">http://mnm.physics.mcgill.ca/</a><br>
------------------------------------</div>
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