Hi Barry - I suggest having an in-depth discussion with your vendor 
     before switching to a matte soldermask. Soldermask may or may not be 
     the source of their problems. There is quite a bit of literature 
     published describing how a matte soldermask is not a prone to 
     solderball/splatter as a glossy soldermask. Yet, we use a glossy 
     soldermask in nitrogen with a low residue flux and have no problems 
     with solderball/splatter type defects. There are lots of other 
     contributing variables (flux type/chemistry is ultra critical in many 
     instances) that may be the root cause for their defects. Do a sanity 
     check on their investigation and solution before you switch. Good 
     luck.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
Subject: assy:  matte or glossy soldermask?
Author:  [log in to unmask] at ccmgw1
Date:    8/27/96 5:55 PM


     
Greetings!
     
We are relatively new to the SMT assembly business.  Our 
vendor wants to switch from a glossy to a matte surface 
soldermask to eliminate a process problem on their end.  
Are there any issues we need to consider? I seem to recall 
a discussion about solder balls hating matte finish.
     
Thanks
     
Barry Allen
SED Systems Inc.
[log in to unmask]
     
     
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