Lou,
     
     We have never allowed silkscreen ink on the pads.  We have had our 
     vendors put the silkscreen on the pads before due to misregistration 
     or errors in their fab artwork.  We have seen solderability problems 
     due to this kind of defect.  If it's not in an industry spec., then it 
     would have to be a requirement in your company's specs. or your 
     individual specs.  PC boards should be DESIGNED such that there is no 
     silkscreen on the pads.
     
     Regards,
     
     Roger Held
     Hitachi Computer Products (America), Inc.


______________________________ Reply Separator _________________________________
Subject: FAB:  Silk-screen ink on surface mount pads
Author:  [log in to unmask] at Internet-HICAM-OK
Date:    5/28/96 8:42 AM


Recently I have seen PC boards with silk screen ink on surface mount 
pads.  Is any of this allowed?  Looking at the PC board IPC standards, I 
don't see this subject addressed.  May I have some guidance?  
Lou Hart   412-858-6117
     
     
.