With reference to Air in the Solution , an overlooked area is the
circulation systems. Make sure that the suction side of the pump has no
leaks, and for best results put the filtration on the pressure side of
the pump. this way you can eliminate cavitation of the impeller by
providing a constant back pressure on the impeller. Also don't forget to
pre-wet your filters to remove most of the air from them before you
install them.
        With todays fine feature technology I don't recommend increasing
the filter rating  much beyond 50 micron absolute .
 ----------
From: Gwerder Lorenz
To: [log in to unmask]
Subject: [TN] Pitting
Date: Saturday, April 03, 1999 3:07AM

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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