[labnetwork] Nanostrip

[Matthieu Nannini, Dr.]

Thanks Mary,

I made a few calculations and if I did not make any mistake, in a 1 US Gallon of Nanostrip, the molar concentration of H2O2 and H2SO5 (a by-product in piranha and a strong oxidizer) are 0.52 and 0.79 respectively. If you compare to 30% H2O2 which is 9.38, Nanostrip is much less of a hazard so it makes sense to keep it in the class 2 oxidizer classification.

Matthieu

Le 2015-05-25 à 17:25, Mary Tang <mtang at stanford.edu<mailto:mtang at stanford.edu>> a écrit :

Dear Matthieu --

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.

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.

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.

Mary


--
Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
Paul G. Allen Bldg 141, Mail Code 4070
Stanford, CA  94305
(650)723-9980
mtang at stanford.edu<mailto:mtang at stanford.edu>
http://snf.stanford.edu<http://snf.stanford.edu/>



On 5/25/2015 11:41 AM, Matthieu Nannini, Dr. wrote:
Colleagues,

My facilities dept. has classified Nanostrip being oxidizing liquid class 3 ( MSDS says NPFA rating are H3, F0, R2 and this<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> says oxidizing liquid category 3).
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.

Does someone has the same issue ?

Thanks

Matthieu


-----------------------------------
Matthieu Nannini
McGill Nanotools Microfab
Manager
t: 514 398 3310
c: 514 758 3311
f: 514 398 8434
http://mnm.physics.mcgill.ca/
------------------------------------




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