Most "clear" soldermasks are slightly cloudy or not crystal clear.  It 
     is due to the fillers etc.  Although with out seeing the board I do 
     not know if it is less or more hazy then "normal."
     
     The line of ending up "crystal clear after mass soldering" is most 
     likely not true.  If anything soldermasks in general become more 
     cloudy after assembly because of interactions with flux.  But if 
     Dynachem believes this ask them to prove it to you!  I would love to 
     see the results.
     
     Good Luck


______________________________ Reply Separator _________________________________
Subject: FAB: Clear LPISM
Author:  [log in to unmask] at corp
Date:    1/23/97 4:06 PM


When using Epic LPI soldermask, clear color, our finished bare boards 
have a slight "haze" left in the finish.  We've been told by Dynachem 
and some of our customers that this is normal and usually ends up 
crystal clear after mass soldering.  Other customers of ours query the 
"cloudiness" or "haze" in the finish.
     
Any help substantiating the normality or abnormality of this 
would be much appreciated.
     
Thanks....John Gordon
          LANmark Circuits, Inc
          (916)272-7280
     
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