We see boards from many, many board shops and 95% of them have little if any
resin recession or hole wall pullaway in their boards prior to or after
thermal stress.

With today's laminate systems and plating systems the condition should not
exist.

Many years ago I had this discussion with a friend in the industry, Terry
Kingston, now in another industry and he acused me of wanting a perfect
board.  My reasoning is that if I have two board shops - one with good hole
wall adhesion and one with little hole wall adhesion - I am going to buy from
the one with good adhesion.  The other boards may be spec compliant, but they
are just not as robust - all other attributes being equal.

I can see where insertion of pins could result in peeling if the hole wall
was not attached and that is a concern.

My two cents

Susan Mansilla
Robisan Lab

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