Is the peeling of the soldermask occurring on the circuits
     or on ground plane areas?
     You might also want to check the date codes of the boards
     that peel against those in the lot that do not exhibit this problem.
     
     It is kind of strange that you would have this problem with
     3 fabricators at the same time. 
     
     Terry Pearo
     Marcel Electronics


______________________________ Reply Separator _________________________________
Subject: Re[4]: Soldermask peeling
Author:  [log in to unmask] at Internet
Date:    12/10/96 10:46 AM


     We don't clean our boards after assembly. We use an Alpha no 
     clean flux, SM351. The peel is noticed immediately after 
     wave. It doesn't affect all boards. In a controlled test 3 
     out of 12 peeled. 
     This is a SMOBC, LPI soldermask. Raw boards are stored at 70 
     Degree F at 10-15% humidity. We don't bake prior to assembly. 
     Of the Suppliers boards that failed, two of the three were 
     received and processed within one week.
     
     
______________________________ Reply Separator _________________________________
Subject: Re: Re[2]: Soldermask peeling
Author:  [log in to unmask] at Internet 
Date:    12/10/96 8:40 AM
     
     
The one thing that concerns me is your comment
that you (an assembler) are experiencing the problem 
with more than one board fabricator.  To me that 
indicates that the cause is the assembly process rather 
than having all fabricators exhibiting the same problem 
at the same time.
     
Does the mask peel immediately after assembly or 
is it noted after cleaning
     
Susan Mansilla
Robisan Labs
317-353-6249
     
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