When I was a soldermask rep, one of my customers bought some 
          clear LPI soldermask from me to cover up his fiducials.  He 
          and his customers were very pleased with the result because 
          they could clearly see the fiducials and the fiducials did 
          not cover with solder during HASL.
          
          MacDermid had the clear LPI soldermask.
          
          Dave Sullivan ([log in to unmask])


______________________________ Reply Separator _________________________________
Subject: Re: ASSY: Polishing Fiducials
Author:  [log in to unmask] at ccmgw1
Date:    11/12/96 6:29 PM


> > >.Gold or OSP finsihes generally do not require 
> > >      this operation.
          
          
> > >
> > >From the What Will They Think Of Next (WWTTON) dept: 
> 
> >  Another request we`ve had in this light (sic) is to leave 
> >  the fiducials as bare copper, allowed to oxidize.  Brings 
> >  an OSP-look to a HASL PWB.
> 
>   fabbers now have to cover the fiducial <somehow> at HASL. We do have 
>   the means, but go explain that to the guy(s) placing dots all over
          
 Yessiree.  Didn't mean to endorse the What They Thought Of... 
 I think (hope) we were at least kind enough to provide a mask 
 artwork in the event a photo- or screen printed method could 
 be devised.
          
 Regards to all,
-- 
          
      Jeff Seeger                             Applied CAD Knowledge Inc 
      Chief Technical Officer                      Tyngsboro, MA  01879 
      [log in to unmask]                               508 649 9800
          
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