All -
For those not familiar with Greg Gallucio's background, he
used to head up the plastics and printed wiring boards
(PWBs) group at UL's Melville, NY, office (among other
things). During my tenure at UL, I also did work in those
two product categories; my wife spent many years working
with them.
There's more here than meets the eye. The UL Recognitions
for PWBs control quite a few parameters about the finished
boards, not just the finishes. Including, but not limited
to:
1) each base laminate, by manufacturer's name and specific
type designations (P/N, cat. no., what ever you want to call
it). These can be either bare laminate with conductors
added by the fab house, or they can be copper clad
industrial laminates; they can be ceramics, flexible
materials like polyimides or even more exotic.
2) the process steps used for temperature excursions above
100C and harsh chemicals, including etchants.
3) the finishes mentioned by John Barnes (though I'm not
familiar with their controlling via or pad sizes)
4) any type of coating
5) conductive inks (carbon, silver, palladium, etc.)
6) marking inks covering more than a minimum % surface area
7) adhesives (commonly used for flexible and flex/rigid
boards)
It can be quite involved, though the concept is rather
simple.
However, I don't think Doug needs to worry about the base
laminate flammability. As I stated previously, it's very
unlikely that a V-0 rated board could use a laminate that
would not also have that rating; one exception is if the fab
house also made the laminate (cake from scratch, where you
reap and winnow your own grain).
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
[email protected]
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