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July 1997

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Subject:
Re[2]: Solder Mask Residue
From:
"tgyee" <[log in to unmask]>
Date:
Wed, 16 Jul 97 09:12:34 PST
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     What is SERA?
     By preclean do you mean the microetch before hot air?


______________________________ Reply Separator _________________________________
Subject: Re: Solder Mask Residue
Author:  [log in to unmask] at corp
Date:    7/15/97 7:26 AM


Hello Mr. Lee
     
We have seen a similar problem in different PCB shops. The problem is that 
the soldermask reacts with the copper surface (oxides) and forms the "shield" 
during the baking. 
     
It is possible to analyze the copper surface by SERA technique prior to the 
HASL operation. If the instrument detects the soldermask residue, it means 
that your precleaning operation is not sufficient enough.
     
If you have more questions about analysis, please let me know.
     
Best regards
Michael Pavlov
ECI Technology
1 Madison st.
E. Rutherford, NJ 07011
(201) 773-8686
     
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