>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 ?


I've used oxide on outers in the past for adhesion. Shouldn't
hurt anything although the thickness should be reduced to a half
or less. "Eliminate potential slivers" sounds like an etching
problem. Is thier work ok in general? Is this a difficult mask
design?



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Hallmark Circuits Inc.,
San Diego

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