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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">Hi
<span class="SpellE">Cenk</span>,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">We try to run ours to a low point, but not quite empty if we can.<span style="mso-spacerun:yes">
</span>For example, we typically run 2000psi cylinders to 200psi then swap the bottle.<span style="mso-spacerun:yes">
</span>For lower pressure cylinders or liquid cylinders measured by weight, we still tend to use that 10% mark as a
<span class="SpellE">changeout</span> point, although, admittedly, some cylinders do inadvertently run to complete empty.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">That said, cylinders do have a shelf life and most university Environmental Health and Safety groups have their own recommendations
on what they consider acceptable.<span style="mso-spacerun:yes"> </span>Many of the semi grade gases “expire” within 3 years.<span style="mso-spacerun:yes">
</span>We have gone well beyond this without any noticeable change in our processes.<span style="mso-spacerun:yes">
</span>However, you have to pay attention to the cylinder itself.<span style="mso-spacerun:yes">
</span>There is a stamped certification date typically imprinted at the top of the cylinder.<span style="mso-spacerun:yes">
</span>This is the date on which the cylinder underwent hydrostatic testing and certification.<span style="mso-spacerun:yes">
</span>Most high pressure gas cylinders are rated 10yrs beyond that date.<span style="mso-spacerun:yes">
</span>If you have a cylinder that is approaching the 10yr mark, send it back (note that your cylinder may not have been filled in year 1, so do not assume that it’s 10yrs past the fill date).<span style="mso-spacerun:yes">
</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">For Cl and other corrosive gases, I believe the limit is typically 5yrs for the cylinder, although, I would need to check
that to be 100% sure.<span style="mso-spacerun:yes"> </span>We tend to swap ours out within 2yrs.<span style="mso-spacerun:yes">
</span>You also have to watch for cylinders containing gases that react with the cylinder material itself.<span style="mso-spacerun:yes">
</span>For instance, anhydrous HF used in vapor HF systems can be purchased in steel (i.e. iron) cylinders.<span style="mso-spacerun:yes">
</span>At the time of purchase, the cylinder pressure is only a couple psi or so.<span style="mso-spacerun:yes">
</span>However, if you hold on to one of these bottles for too long, the HF can react with Fe to release hydrogen, causing the cylinder to
<span class="SpellE">overpressurize</span> and possibly explode.<span style="mso-spacerun:yes">
</span>It is typically recommended to exchange such cylinder within 2yrs.<span style="mso-spacerun:yes">
</span>For that reason, we use nickel cylinders on this material and still follow the 2yr rule.<span style="mso-spacerun:yes">
</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">Best Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><br>
Matt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-no-proof:yes">--
<br>
<b>Matthew T. Moneck, Ph.D.</b><br>
Executive Manager, Claire & John Bertucci Nanotechnology Laboratory<br>
Electrical and Computer Engineering | Carnegie Mellon University<br>
5000 Forbes Ave., Pittsburgh, PA 15213-3890<br>
T: 412.268.5430<br>
F: 412.268.3497<br>
<a href="http://www.ece.cmu.edu/">www.ece.cmu.edu</a><br>
nanofab.ece.cmu.edu<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman""> labnetwork-bounces@mtl.mit.edu
[mailto:labnetwork-bounces@mtl.mit.edu] <b>On Behalf Of </b>Cenk Yanik (Alumni)<br>
<b>Sent:</b> Wednesday, October 09, 2019 2:59 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] RIE Process Gases<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Dear All,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">We are wondering how often do you change the RIE process gases even the gases are not run out. We have been told that they should be changed in max 3 years even if they are almost full but we have been using some of them (SF6, C4F8, CHF3)
for 5 years and we didn't realize any process-related critical problems during the dry etching process.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Have you ever faced with any problems for Fluorine and Chlorine based gases in your institutes?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">We would appreciate if you could share your experiences and regulations considering the shell life of the process gases at your facilities<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
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<p class="MsoNormal"><br>
<span style="font-family:"Tahoma",sans-serif">Cenk YANIK, PhD</span><o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Tahoma",sans-serif">Nanofabrication Team Leader</span><o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Sabanci University
<br>
Nanotechnology Research and Application Center ( SUNUM )<br>
Orta Mahalle, Üniversite Caddesi No: 27 34956 Tuzla - İstanbul<br>
Office:+90 216 483 9994<br>
web:</span> <a href="http://sunum.sabanciuniv.edu">sunum.sabanciuniv.edu</a><o:p></o:p></p>
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