I have not experienced the resin beads but it is good to keep in mind 
     for future reference.  A good filtration system should capture most 
     anything suspended in solution.  The main problem with most plating 
     tank filtration systems is there's really no way to "suck" up 
     everything off the tank floor.  Any disturbance reaching the bottom 
     will kick up debris which may eventually end up on the PCB.  A general 
     rule is about 3 turnovers per hour.
     
     DNHJR


______________________________ Reply Separator _________________________________
Subject: Plating Particulates
Author:  [log in to unmask] at corp
Date:    2/7/97 4:53 AM


Suppose you're plating in an acid copper bath and notice particles from 
vacuum filtration in the lab.
     
You then arrive at the conclusion these are resin beads that have 
fragmented out of the DI unit.
     
What are the ramifications?
Has anyone seen this?
Can they be filtered by bath recirculation?
What is the normal turnover (recirculation) time in an acid copper bath?
     
Thank you in advance,
Chemist
     
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