I am assuming this is a double-sided board from your description - DSPTH.
Double sided boards rarely go through
desmear processes that would remove drill smeal on the outer foil as compared
to multilayer board.  Therefore in
the distant past "smear" found on doublesided boards was not considered to be
a concern and because there was the entire land connection on the surface
foil.  Therefore your boards should be ok and compliant with the
specification if the separation/contamination does not extend "around the
knee".

The current rev of 6012 that allows separation/contamination not only at the
interface between plating and foil, but
also between any plating interface at this area is another story and I don't
want to start that battle.

Susan Mansilla
Technical Director
Robisan Lab

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