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April 2008

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Subject:
From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Fri, 18 Apr 2008 09:10:03 -0700
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Sounds like a bad green chili burro I had once.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Friday, April 18, 2008 5:46 AM
To: [log in to unmask]
Subject: Re: [TN] Out Gassing

A PWB fabrication company I worked for years ago left a rack of boards
in a sulfuric acid bath over lunch. The operators figured sulfuric acid
removes copper oxides so it would be a good holding bath. The resin was
softened and swelled. In assembly, or heating with a soldering iron, the
resulting out gassing produced what looked like mini volcanic eruptions
from which copious amounts of white smoke issued. No degree of baking
could prevent the out gassing. 


Paul Reid


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