Item Subject: PLUGGED VIAS -Reply
     The only soldermask I am aware of that can plug vias is dry film mask. 
      If there is an LPI mask that can covers vias can someone tell me 
     about this.
     
     Thank You:
     Steve O'Hara
     


______________________________ Reply Separator _________________________________
Subject: PLUGGED VIAS -Reply
Author:  Non-HP-bmetcalf ([log in to unmask]) at 
HP-Vancouver,shargw2
Date:    10/14/96 11:12 AM


If you are using a photo defined solder mask, you can control which 
pads are covered/filled and which pads are cleared.
     
Bob Metcalf 
Morton Electronic Materials
     
>>> Barry Darnell <[log in to unmask]> 10/14/96 11:41am >>>
     
I have run into a problem with a board that has vias in smt pads.  We 
need all of the vias plugged, and I am told that solder mask is the best 
way to do that.  This is to ensure that a good vacuum is maintained for 
our ATE equipment.  That is the problem.  I can not have a via covered 
with solder mask on top of an smt pad.  The board house I am using says
 this is difficult for them because they have to determine which vias are 
plugged and which are not.  Anyone out there with any suggestions?
     
Thanks,
     
    Barry Darnell
(864)627-8800 Ext. 231 [log in to unmask] 
CD Electronics, Inc.
Printed Circuit Board Designer
     
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