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March 2007

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Subject:
immersion silver and exposed copper in small vias
From:
Fran Juliot <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Fran Juliot <[log in to unmask]>
Date:
Tue, 6 Mar 2007 09:57:56 -0600
Content-Type:
text/plain
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text/plain (16 lines) 
Our customer is questioning what they feel is exposed copper in 8 mil vias 
holes on silver boards.  We feel there is mask residue in the holes which does 
not allow silver to take.  These are holes that are allowed to be plugged.  Has 
anyone else ran into this issue with thier customers and do you have the same 
look or are your small vias covered with silver all the way through the via?  

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