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

[Matthew Moneck]

Hi Mario,

We have experienced this as well, particularly when shipments arrive (the
bottles are often bloated and we have found that chemical sometimes leaks
into the bags during shipping).  In order to prevent this after we take
delivery, we replace the company-supplied solid caps with vented caps upon
arrival.  We also keep the bottles in secondary containment at all times
should additional leaks occur.  The vented caps largely seem to mitigate
the issue, but they still require monitoring (and potential rinsing).

You should also be aware that the plastic on the bottles may be degraded
and subject to rupture if stored past the expiration date.  We have not yet
had any issues with Pure Strip, as we typically go through an order within
the expiration period.  However, another lab on campus experienced this
problem with Nanostrip (similar formulation to that of Pure Strip) that was
stored past expiration.

Best Regards,

Matt

On Mon, Nov 17, 2025 at 4:46 PM Beaudoin, Mario <beaudoin at physics.ubc.ca>
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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-- 

--
Matthew T. Moneck, Ph.D
Executive Director, Claire & John Bertucci Nanotechnology Laboratory
Electrical & Computer Engineering | Carnegie Mellon University
5000 Forbes Avenue, Pittsburgh, PA 15213-3890
Phone: 412-268-5430
ece.cmu.edu
nanofab.ece.cmu.edu
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