H2SO4 pots on wbnonmetal

Jim McVittie mcvittie at cis.Stanford.EDU
Fri Sep 8 12:49:42 PDT 2000


This is the first I heard about this contamination problem. If we can not
find which hot pot is contaminated, they both have to be shut down
immediately for cleaning. Does anyone know who may have been using a
thermometer in any of the hot pots?

James P. McVittie, Ph.D.                Senior Research Scientist
Rm. 336            			jmcvittie at stanford.edu
Allen Center for Integrated Systems	Tel: (650) 725-3640	
Stanford University			Fax: (650) 723-4659
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Stanford, CA 94305-4075			Via Ortega
					Stanford, CA 94305-4075

On Fri, 8 Sep 2000, Amol Ramesh Joshi wrote:

> 	Hi,
> 	I found an anonymous note on wbnonmetal stating that there is
> broken thermometer glass in H2SO4. The note does not say whether it is
> Left or Right H2SO4 pot. I saw broken wafer and glass in left pot. I also
> saw some white stuff floating in right pot. There were no problems
> reported on Coral for wbnonmetal!
> 	Jim, is there a chance of contamination if thermometer glass is
> broken?
> 	Thanks,
> 	- Amol

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