Really????
          No catalyst on the PTH line?
          No alkaline etchant?
          No reflow/HASL flux?
          Need I go on?
          
          It may be that this is not their fault.  However, they have a VERY 
          unique board shop if they don't use one or more of these processes.  I 
          suggest they could be more cooperative in helping to get to the root 
          of the problem.
          
          Dave Sullivan
          Rockwell Collins, Inc.
          
          [log in to unmask]

______________________________ Reply Separator _________________________________
Subject: ASSEM: Copper Choride problem
Author:  [log in to unmask] at ccmgw1
Date:    1/8/97 8:02 AM


     Hi, 
     Recently we encountered some assembled PCB returned from the 
     field where humidity is high and temp is low. Some vias and pads 
     were found to be corroded with copper chloride after SEM analysis 
     and when corrosion production were removed from the board, the 
     affected part of the vias was degraded.  This has greatly 
     affected the performance of the circuit.
     The fabrication house claimed that they are not liable as there 
     was not chloride
     
     chemical used in their processes.  
     Does anyone has any insights to share?  Could the assembly 
     process contribute to
     
     this corrosion?
     
     Thanks in advance for any information shared.
     
     
     stella yap
          
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