What is the board temperature through the wave machine? Max. bottomside 
board temp?  What is the board dwell time in the solder?   If these are all 
within "norm",  I would check with the supplier of the cards.  Maybe the 
soldermask was not cured properly?
 ----------
From: TechNet-request
To: TechNet
Subject: Re[4]: Soldermask peeling
Date: Tuesday, December 10, 1996 11:47

     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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