Craig, it seems the minimal conductor spacing conforming 6.3 (table 6-1)
prevents shorts as a result of contamination, delamination, conductive
particles, etching imperfections (crest and overhang). Such
imperfections would faciliate shorts independent of the base material.
Bernhard Wanner

        ----------
        Von:  Craig Hillman[SMTP:[log in to unmask]]
        Gesendet: Freitag, 18. Juni 1999 12:00
        An:  [log in to unmask]
        Betreff:   [TN] IPC-2221 Table 6.1 Conductor Spacing

        I was wondering if anyone could provide me with information on
the
        research used to determine the conductor spacing requirements of
        IPC-2221. More specifically, why is it not material dependent
and
        is there a safety factor provided in the spacing determination?

        Any help would be greatly appreciated.

        Thanks in advance,
        Craig Hillman
        University of Maryland





        Dr. Craig Hillman
        CALCE Electronic Products and Systems Consortium
        University of Maryland
        College Park, MD  20742
        (301)-405-5316
        [log in to unmask]