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Subject:	Re: SMT Solder Joint Film
From:	"ddhillma" <[log in to unmask]>
Date:	Tue, 15 Oct 96 16:34:22 cst
Content-Type:	text/plain
Parts/Attachments:	text/plain (57 lines)

     Hi Ed -
     
     I suggest you run a FTIR scan (Fourier Transform Infrared) on your 
     unknown film. The FTIR test results should give you the chemical clues 
     to determine the source of the film. I suggest you also talk to Doug 
     Pauls ([log in to unmask]) - he could suggest several other techniques 
     that may be beneficial. Without knowing what type of flux materials 
     and cleaning systems you are using a guess on what the film could be 
     might be totally skewed. Can you provide more process type details?
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
Subject: SMT Solder Joint Film
Author:  [log in to unmask] at ccmgw1
Date:    10/15/96 2:17 PM


     
We are noticing a film on our SMT solder joints.  It doesn't seem to 
affect ionic cleanliness or conformal coating adherence, but can only 
be removed mechanically with a brush or Q-tip.  It has a slightly 
yellowish color in most cases and appears powdery.  Is this 
contamination from the PWB pads or part leads floating to the top, or 
a compound derived from the solder paste (63/37 RMA)?  Any insight 
into what this contamination is would be appreciated.
Thanks.
     
Ed Knowles
Lockheed Martin Astronautics
     
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