[labnetwork] Nanostrip

[Mary Tang]

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
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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