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

[Prashant Srinivasan]

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
>
> -- 
>
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-- 
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
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