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April 1997

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Subject:
Re: FAB: HASL Finish
From:
"ddhillma" <[log in to unmask]>
Date:
Wed, 23 Apr 97 11:05:48 cst
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     Hi TechNet -
     
     You can use ANSIJ-STD-003 for the evaluation of solderable finishes. I 
     would not recommend visual criteria as the sole indicator of the 
     'goodness' of a surface finish. Visual criteria can be useful but some 
     type of reflow test would be recommended. HASL finish thicknesses can 
     vary greatly across a pwb. Good Luck.
     
     
     Dave Hillman
     JSTD 003 Chairman
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: FAB: HASL Finish
Author:  [log in to unmask] at ccmgw1
Date:    4/22/97 8:02 PM


First I appreciate the information I  received from my previous post.
     
I need some help  for solder finish of PCB. Why do they look dull and 
hazel sometime  ( not uniform and shinny). Manufacture checks the solder 
pot and everything ,including copper content, is within range. What I see 
there is quite heavy flux floating on the top of the solder and solder 
flow is quite slow ( flux is OA type).
     
What will be the best way for Manufacture controlling  the solderability 
without damaging boards. Now only visual check and wait for complaining.
     
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