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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>I have had the unfortunate experience of witnessing this a few times over the years and I agree with Leif Johansen about the cause. In most of my experiences, the fire erupted in a HEPA vacuum used for cleaning a source chamber in an E-beam evaporator. The person cleaning the TI pocket would perform some sort of scraping followed by a wipe with isopropanol. In all cases after performing an “autopsy” of the vacuum, there was a clean room wipe or piece of clean room wipe inside the dirt chamber. We didn’t believe there was a chemical reaction with the propanol but we did believe that the TI was rapidly oxidizing since it was physically removed from its place, combined with a fuel (isopropanol and wipes), in an environment of rushing air. The fix was to have a metal bucket of water nearby to dispose of any debris produced by cleaning the TI pocket and having it removed as reactive waste when full.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Steve Paolini<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Harvard University Center for Nanoscale Systems<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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>Morrison, Richard H., Jr.<br><b>Sent:</b> Monday, May 06, 2013 9:50 AM<br><b>To:</b> labnetwork@mtl.mit.edu<br><b>Subject:</b> [labnetwork] Titanium hazard<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi Everyone,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Last week one of the staff was wiping off some evaporator parts that were covered with Titanium metal. He was using texwipes soaked with IPA. He tossed the texwipes in the trash then accidentally dropped some wipes saturated with IPA on top of them and a fire started. It self extinguished after 1 minute but it melted the bottom of a plastic trash can.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Have any of you had that happen or something similar? Needless to say this is very alarming and I need to understand what could have caused this and develop a corrective action plan.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Rick<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Draper Laboratory<o:p></o:p></p><p class=MsoNormal>Group Leader Microfabrication Operations<o:p></o:p></p><p class=MsoNormal>555 Technology Square<o:p></o:p></p><p class=MsoNormal>Cambridge Ma, 02139-3563<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://www.draper.com">www.draper.com</a><o:p></o:p></p><p class=MsoNormal><a href="mailto:rmorrison@draper.com">rmorrison@draper.com</a><o:p></o:p></p><p class=MsoNormal>W 617-258-3420<o:p></o:p></p><p class=MsoNormal>C 508-930-3461<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>