yes to both on Matte mask under most circumstances. This is based upon 
     experimental derivation. Matte mask offers less surface area for 
     solderball adhesion in wave, but more area for conformal coat. 
     
     P.S. matte mask is also more difficult to clean than glossy mask.


______________________________ Reply Separator _________________________________
Subject: Assy: LPI Matte vs Gloss and Conformal Coating
Author:  [log in to unmask] at internet
Date:    8/20/96 9:39 AM


We are beginning to see more PCB suppliers offering matte finish LPI.  We 
have heard that this finish reduces the adherence of solderballs.  Is this 
true?  If so, at which process, reflow or wave?  What is the science behind 
this lessening of solderballs?
     
2nd Question: We are also starting a project that will require conformal 
coating. Is there a preference in solder mask type/finish? The coatings we 
are leaning towards are silicone-based.
     
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