Can you determine if the pits are irregular in shape, or are they more
uniform in shape, and concave? This is important, as pits can arise from
either entrapped air bubbles, or can arise from organic residues. Usually,
irregular pits are caused by some type of organic residue.

Good luck,

Mike Carano
        -----Original Message-----
        From:   Gwerder Lorenz [SMTP:[log in to unmask]]
        Sent:   Saturday, April 03, 1999 2:08 AM
        To:     [log in to unmask]
        Subject:        [TN] Pitting

        We are a PCB manufacturer and are currently dealing with the
"PITTING"
        problem. Small holes, craters in the electrolitic copper.
        Is there any acceptability guideline corresponding this problem. I
did
        not find it in the IPC-A-600.


        Thanks for your help


        Lorenz Gwerder


        [log in to unmask] <mailto:[log in to unmask]>
        www.photochemie.ch <http://www.photochemie.ch>

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