<div dir="ltr"><div class="gmail_default" style="color:#0b5394">Hi Mario,</div><div class="gmail_default" style="color:#0b5394"><br></div><div class="gmail_default" style="color:#0b5394">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).</div><div class="gmail_default" style="color:#0b5394"><br></div><div class="gmail_default" style="color:#0b5394">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. </div><div class="gmail_default" style="color:#0b5394"><br></div><div class="gmail_default" style="color:#0b5394">Best Regards,<br><br>Matt</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Nov 17, 2025 at 4:46 PM Beaudoin, Mario <<a href="mailto:beaudoin@physics.ubc.ca">beaudoin@physics.ubc.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p>Dear Labnetwork,</p>
<p>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. </p>
<p>I am now thinking of revising this policy and going back to old
pirahna, despite the issues with safety and aging H2O2.</p>
<p>Anyone have comments?</p>
<p>Mario</p>
<div>-- <br>
<img src="cid:ii_19a94d9eb2be557f5d81" border="0"></div>
</div>
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</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><p class="MsoNormal">--<br>
Matthew T. Moneck, Ph.D<br>
Executive Director, Claire & John Bertucci Nanotechnology Laboratory<br>
Electrical & Computer Engineering | Carnegie Mellon University<br>
5000 Forbes Avenue, Pittsburgh, PA 15213-3890<br>
Phone: 412-268-5430<br>
<a href="http://ece.cmu.edu" target="_blank">ece.cmu.edu</a> <br>
<a href="http://nanofab.ece.cmu.edu" target="_blank">nanofab.ece.cmu.edu</a> </p></div></div>