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One issue with "automatic removal of access": <br>
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punitive measures are not the best if safety is involved. Especially for minor things, where user may have a small event that didn't lead to serious consequences - but the user may share the problem, get some advice, and some things may improve after all. If
user is discouraged from that by automatic punishment, then things work worse overall.<br>
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It's a big philosophic question in general but looks like safety actually benefits from a less punishing approach. Of course, such dilemmas go well beyond cleanroom or chemical safety and experience comes from many industries. I heard a lot of such discussions
in aviation safety - and I would call that even more safety-critical business than what we're doing...<br>
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Thanks</div>
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Mike</div>
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<p style="font-size:11pt; font-family:Calibri,sans-serif; margin:0"><span>Michael Yakimov</span></p>
<p style="font-size:11pt; font-family:Calibri,sans-serif; margin:0"><span>Research scientist</span></p>
<p style="font-size:11pt; font-family:Calibri,sans-serif; margin:0"><span>College of Nanoscale Science and Engineering</span></p>
<p style="font-size:11pt; font-family:Calibri,sans-serif; margin:0"><span>SUNY Polytechnic Institute</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Savitha P <savithap@iisc.ac.in><br>
<b>Sent:</b> Thursday, February 23, 2023 3:32 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> Re: [labnetwork] HF storage</font>
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Dear All:</div>
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Thank you very much for all the suggestions. We have currently incorporated the following as per our space availability. HF has been segregated and kept in a secondary container so that users will not mistake the same with HCl. Size of Labels on the bottles
have been increased for HF only, so that users have another mark for identification. As per our protocol, all safety incidents at wet etch leads to an automatic removal of access to the cleanroom. The user will be allowed only after a retraining and retest
and will be provided access only after a satisfactory drive in.</div>
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Regards,</div>
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Savitha</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Jing Guo <jeanne.guo@rice.edu><br>
<b>Sent:</b> 16 February 2023 21:41<br>
<b>To:</b> Savitha P <savithap@iisc.ac.in><br>
<b>Cc:</b> labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> Re: [labnetwork] HF storage</font>
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External Email</div>
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<div>Hi Savitha,
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<div class="">This is Jing from Rice U Nanofab. Fortunately we have enough space to store HF or BOE in a separate cabinet. HCl is stored with the other acids in the ‘General Acids’ cabinet. Also all HF related processes will be performed in the separate HF
wet bench which is a independent bench from other benches. For all of our chemicals, we are using the ’Two-letter’ labelling system which I learned from Utah NanoFab a long time ago. All chemical bottles, storage cabinets and wet benches have a ’two letter’
sticker on. All HF bottles have the ‘HF’ stickers. HCl or other Acids have the ‘GA’ stickers (general acid). The stickers have to match to the cabinets and benches when you need to store or use them. </div>
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<div class="">For very limited lab or storage space, the simple solution I can think about will be separate secondary containers with different colors, and put different color stickers on the bottle caps. Also put a big color chart beside the storage cabinets
and benches to clarify which is which.</div>
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<div class="">I totally agree with Tony, no matter how great foolproof your system is, there will still be someone making mistakes. Wish our system can provide some idea to help. </div>
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<div class="">Best,</div>
<div class="">Jing <br class="">
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Jing Guo Ph.D.</div>
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Research Scientist</div>
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SEA Cleanroom (SST 017)</div>
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Rice University</div>
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Houston, TX </div>
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<a href="mailto:jeanne.guo@rice.edu" class="">jeanne.guo@rice.edu</a></div>
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713-348-8227</div>
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<div class="">On Feb 15, 2023, at 6:19 AM, Savitha P <<a href="mailto:savithap@iisc.ac.in" class="">savithap@iisc.ac.in</a>> wrote:</div>
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Hi!</div>
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We recently had a couple of occasions where users had mistakenly used Hydrofluoric acid in place of Hydrochloric acid during RCA cleaning. To avoid this, one of the suggestions we have received from our OLSEH is to store HF in a different coloured bottle (currently
all acids are stored in white translucent polypropylene bottles which are properly labelled). Accordingly, we had considered storing HF in opaque, brown colour HDPE bottles. However, that was not deemed acceptable by a section of users saying bottles should
be translucent so that acid level inside can be judged.</div>
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Could you please let me know how small quantities of HF are stored in your respective fabs. Is there any regulation governing storage of HF, so that we could implement the same.</div>
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Thanks and regards,</div>
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Savitha</div>
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<div class="">Dr. Savitha P<br class="">
Chief Operating Officer</div>
<div class="">National Nanofabrication Centre<br class="">
Centre for Nanoscience and Engineering<br class="">
Indian Institute of Science<br class="">
Bangalore - 560012<br class="">
India.<br class="">
Ph. +91 80 2293 3319<br class="">
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