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<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I have used a reflux condenser (Lab Glass) with a heated jacket. I have never had the need for a stir bar with the heated jacket. For the condenser coil I use either cold water or a recir system to save on water
going to the drain.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The web site for Lab Glass is <a href="http://www.wilmad-labglass.com/ProductList.aspx?t=108">
http://www.wilmad-labglass.com/ProductList.aspx?t=108</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The beaker has a large flat on the top which is clamped to the cover. The cover has 3 holes, one for the condenser, one for a T/C and one extra, this works great for KOH and I also use it for EDP. The beaker
fits into a heater jacket. This applies even heat to the solution so a stir bar is not needed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Good luck.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rick Morrison<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Draper Laboratory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Group Leader Microfabrication Operations<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">555 Technology Square<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Cambridge Ma, 02139-3563<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">www.draper.com<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">rmorrison@draper.com<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">W 617-258-3420<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">C 508-930-3461<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Tony L Olsen<br>
<b>Sent:</b> Monday, July 22, 2013 6:03 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] KOH Tank Design<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear Labnetwork<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are building a new wet bench and would like to include a dedicated KOH etch bath to replace the current methodology of glassware with stir bars on a hotplate. We generally use a bath of 80°C.<o:p></o:p></p>
<p class="MsoNormal">Our wetbench vendor initially quoted a recirculated bath in a stainless steel tank. We are concerned about the stainless, nor do we believe the Teflon or PVDF wetted surfaces in the proposed diaphragm pump will hold up to the hot KOH.
Another option we are aware of is a quartz tank heated externally by recirculated water. I’m certain there are other options, too.<o:p></o:p></p>
<p class="MsoNormal">Can you share your experience with dedicated KOH baths? What is the configuration? What are the materials? How do you mix/stir the bath? What problems have you experienced? What would you do next time?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank You,<o:p></o:p></p>
<p class="MsoNormal">tonyO<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tony Olsen<o:p></o:p></p>
<p class="MsoNormal">Nanofab Cleanroom Supervisor/Process Engineer<o:p></o:p></p>
<p class="MsoNormal">36 S Wasatch Dr, Suite 2500 SMBB<o:p></o:p></p>
<p class="MsoNormal">Salt Lake City, UT 84112<o:p></o:p></p>
<p class="MsoNormal">801-587-0651 office<o:p></o:p></p>
<p class="MsoNormal">801-587-3077 fax<o:p></o:p></p>
<p class="MsoNormal"><a href="http://www.nanofab.utah.edu/"><span style="color:#6666CC">www.nanofab.utah.edu</span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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