There is a great little book about rinsing by Kushner and Kushner called 
"Water and Waste Control in the Plating Shop."  I think it is published by 
Gardner Press.  They provide formulas and sample calculations for 
maintaining rinse water quality, including calculations for counterflow 
rinses, DI, air agitation, etc.  Highly recommended!

Don't forget the other side to rinse water quality - dwell time in the 
rinse, taking any agitation methods into account.

P.S. - I have tried the acid vs. caustic finger rinse test with gloves on 
and the caustic stuff still feels slimy and seems to take longer to rinse. 
 Now we need to see a good scientific test!

Patty
 ----------
From: Bob Lundquist
To: 'IPC TechNet Server'
Subject: RE: Fwd: Fab: Rinse water quality
Date: Wednesday, June 18, 1997 3:36PM



First, I agree with everything Rudy Sedlak said about the myth of rinsing
alkaline vs. acid solutions and am not surprised by his story.

Next, just a few words about rinse quality -- it depends
Depends on incoming water quality and desired end-results
What seems to work the most is to measure the incoming water quality with a
conductivity meter and then monitor the oxide rinse water until your quality 

is affected such as by low peels.  In other words, impirically  determine
the rinse water quality control point by trial and error by sneaking up to
the control point from the clean side.  So first double the conductivity of
the incoming water as a control point.  If all looks well, double it again
and so on until you have problems, then back off and zero in on a specific
point to control water flow that gives you the quality you need.
If you don't want to putz around with a conductivity meter, adjust the flow
rate of the water and the time it is on until you find a working
combination.  However, the resolution of the control point will have a
relatively high error thereby wasting water.  Actually measuring the quality 

somehow will use the water most efficiently.
 ----------

Robert Lundquist
Assistant Director
Minnesota Technical Assistance Program
Suite 207
1313  Fifth St SE
Minneapolis,  MN  55414

Phone: 612-627-4557
 FAX:  612-627-4769

E-Mail:  [log in to unmask]

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