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Thu, 17 Mar 2011 17:48:02 -0400 |
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Hi Doug,
After looking at the picture a little closer, my question is why would
somebody put this cap through reflow? It looks to me like a Cornell Dubilier
MLP or MLS electrolytic cap which are through-hole and very expensive.
Dealt with them not too long ago in a past life, and the last thing I would
do with these babies is put them through reflow...
Steve
-----Original Message-----
From: Douglas Pauls
Sent: Thursday, March 17, 2011 12:09 PM
To: [log in to unmask]
Subject: [TN] Hydrogen gas analysis
Good morning all,
I am posting this question for a colleague (not Hillman).
Take a look at this picture which Steve has graciously posted on his web
page.
http://stevezeva.homestead.com/Bowed_Electrolytic.jpg
This is an electrolytic capacitor and I don't have any access to the
processing history. Presumably it went through reflow. My colleague
would like to determine if there is hydrogen in this swelled device and if
so, what percentage. There is presumably both liquid and gas inside the
swelled area which would complicate any standard residual gas analysis.
Hydrogen is too light for GCMS detection.
OK all you chemists, how would hydrogen presence and concentration be
determined here? And do you know of any commercial labs which would
perform that service?
Doug Pauls
Rockwell Collins
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