Hi Jim -
     
     I haven't the foggiest idea what your brown residue is but you could 
     conduct a Fourier Transform Infrared (FTIR) analysis to pinpoint its 
     identity. FTIR analysis is the organic material analysis counterpart 
     to Scanning Electron Microscopy (SEM) analysis for elements. With the 
     FTIR analysis you can compare the residue scan with a phenolic scan, a 
     solder mask scan, and a lacquer scan to see if any match. Good Luck.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
Subject: Brown resin like residue in solder bath
Author:  [log in to unmask] at ccmgw1
Date:    12/11/96 3:14 AM


We have recently experenced a brown resin like substance in our 
solder bath after wave solder of a qty of paper phenolic pcbs. 
The boards have a solder resist and laqer finish.
Can anyone tell me what this bown substance is and what is the cause.
     
Thank you
     
Jim Hedderick
[log in to unmask]
     
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