[labnetwork] Nanostrip/Purestrip bottle leakage: what do most labs do?

[Beaudoin, Mario]

Thanks to all who replied to my post.  Very useful.

Mario


On 2025-11-17 7:18 p.m., Martin, Michael wrote:
> [*CAUTION:* Non-UBC Email]
>
> Yeah, don't buy it.  Just make it as needed and keep a close eye on 
> the students.  These days we only really use it to clean stubborn 
> debris on masks and a few other relatively small volume applications. 
> That said, we do have an acid waste neutralization system.
>
> -Michael
>
> ------------------------------------------------------------------------
> *From:* labnetwork <labnetwork-bounces at mtl.mit.edu> on behalf of 
> Prashant Srinivasan <prashant at ucsb.edu>
> *Sent:* Monday, November 17, 2025 8:39 PM
> *To:* Beaudoin, Mario <beaudoin at physics.ubc.ca>; 
> labnetwork at mtl.mit.edu <labnetwork at mtl.mit.edu>
> *Subject:* Re: [labnetwork] Nanostrip/Purestrip bottle leakage: what 
> do most labs do?
>
> *CAUTION:* This email originated from outside of our organization. Do 
> not click links, open attachments, or respond unless you recognize the 
> sender's email address and know the contents are safe.
>
> Mario,
>
> Is there a particular reason you absolutely need Piranha? I made the 
> switch to RCA in our teaching cleanroom after getting tired of 
> cleaning up spills. Even a few drops burn leave burn marks. RCA is 
> fairly dilute (5:1/6:1) and the use temperature is only 70 C. Also, 
> adding peroxide isn't as fraught. No matter how "well trained" the 
> students are, the Piranha preparation process is unforgiving. Hazards 
> to users, chemical waste and disposal risk (I don't have 
> neutralization capabilities) drove my decision making.
>
> Prashant
>
>
> On 11/17/2025 10:48 AM, Beaudoin, Mario wrote:
>
>     Dear Labnetwork,
>
>     As many labs do, because of safety concerns for the students, I
>     banned the use the real pirahna etch in favor of Purestrip
>     (Transene version of nanostrip).  The problem I have is that the
>     solution eventually leaks from the bottle.  I have heard of others
>     mentioning this also.
>
>     I am now thinking of revising this policy and going back to old
>     pirahna, despite the issues with safety and aging H2O2.
>
>     Anyone have comments?
>
>     Mario
>
>     --
>
>     _______________________________________________ labnetwork mailing
>     list labnetwork at mtl.mit.edu <mailto:labnetwork at mtl.mit.edu>
>     https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork
>     <https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork>
>
> -- Prashant Srinivasan, Teaching Cleanroom Engineer Electrical & 
> Computer Engineering University of California, Santa Barbara Santa 
> Barbara, California 93106 
> https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr 
> <https://www.ece.ucsb.edu/department-resources/electronics-shop/tcr>
-- 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mtl.mit.edu/pipermail/labnetwork/attachments/20251118/111fa563/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Mario Beaudoin SBQMI sig 3.jpg
Type: image/jpeg
Size: 22413 bytes
Desc: not available
URL: <https://mtl.mit.edu/pipermail/labnetwork/attachments/20251118/111fa563/attachment.jpg>