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April 2008

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Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Fri, 18 Apr 2008 08:56:52 -0400
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Are you telling me your pwb smell like rose? RoHSe!?  
--------------------------
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----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Fri Apr 18 08:46:04 2008
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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