Do not panic.
     
     Depending on the solder mask and your wave soldering conditions (flux 
     etc.) this might be normal for the solder mask in question and 
     although not desirable, it might be acceptable.  What I mean by 
     acceptable is that the performance properties of the solder mask was 
     not compromised.  The condition, for example, could only be a surface 
     attack and has discolored the mask.
     
     More research needs to be done.  You should call the solder mask or 
     Board Fab. Manufacturer to take a look at the boards and the wave 
     soldering parameters.
     
     Hope this helps


______________________________ Reply Separator _________________________________
Subject: Soldermask question
Author:  [log in to unmask] at corp
Date:    2/28/97 2:22 PM


We are just beginning to use soldermask on our PC boards.  We are 
specifying liquid or dry s/m over bare copper (no surface mount).  Our 
assembly group is also new at inspecting soldermask boards.  They have 
seen on one part (from another division) where the soldermask changes 
visually after wave solder.  It changes from a 'glossy' look to a 'dull' 
or 'etched' look.  They are unsure if this is a problem.
     
I have looked thru the ANSI/IPC-SM-840B for any information about this, 
but have found none.  Have any of you experienced a similar situation 
with soldermask?  I do not know the type of mask, the vendor, or 
anything else about the board in question (I've asked our assembly group 
to see if they can get this info).  I just want to make sure to specify 
the right thing on my drawings without limiting our board vendor(s) too 
much and calm any fears of our inspectors.  
     
Thanks for any help...
Ben Davis
Systems & Electronics, Inc.
     
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