Yup, sounds like a Band-Aid to me.  This is a carry-over from the 
     days when dryfilm soldermask was more popular.  An oxide coating 
     on outerlayers can improve adhesion of soldermask; but should not 
     be necessary with most masks in use today.  
     
     On the other hand, if the end user has no objection, it shouldn't 
     hurt.
     
     Mark Dowding
     Multek, Irvine


______________________________ Reply Separator _________________________________
Subject: Black oxide on outer layers
Author:  [log in to unmask] at INTERNET_GATEWAY
Date:    9/25/96 12:03 PM


Greetings !
     
The Fab house that we use has recently asked us if they could use a black 
oxide treatment on external layers of our designs. I know that this process 
is used for internal layers but I want to know if any of you have used it 
for external layers ? Their reason for using it is " To create better 
adhesion for the solder mask and eliminate potential slivers ". To me, this 
sounds more like a process problem. What do you think ?
     
To recap, do any of you use a black oxide coating on outer layers ?   If so,
 why ?.   If not, why not ?
     
Thanks in advance for your help !
     
Lou Takach
     
Union Switch & Signal Inc.
412.688.2574 (voice)
412.688.2399 (fax)
[log in to unmask]
     
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