See this year's IPC Technical Proceedings S15-4-1 "The War on Plating Pits
- An Update" by Richard Olsen of DuPont.
Root cause is normally air supersaturation.
Check that air bubbles cannot enter your filter pump suction, ensure that
you have plenty of NPSH so that your pump does not cavitate, and/or try
increasing to a larger micron filter.

J.Felts

-----Original Message-----
From:   Gwerder Lorenz [SMTP:[log in to unmask]]
Sent:   Saturday, April 03, 1999 1:08 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>

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section
for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################