Emilio:

At risk of doing your suppliers job for them, typically, oxide thickness is
controlled by weight loss after stripping.

Typical process is to take a coupon which has been run down the oxide line,
and then removed from line BEFORE any anti-pink ring treatment.  Coupon is
dried at 120 degrees C for 15 minutes, and weighed to 0.1 mg.   Coupon is
then stripped of oxide in 20% HCl (15 seconds?) rinsed quickly, and
thoroughly under running water, and given a final deionized water rinse.  Dry
again at 120 degrees C, for 15 minutes, and reweigh.

Calculate weight loss per square cm of exposed Copper.

Typical weights will run 0.5-0.6 mg/square centimeter.

As Michael Carano said, too much weight gives poor bond strength, too little
weight gives a spotty performance in the anti-pink ring treatment, although
better bond strength.

Does this help?

Rudy Sedlak
RD Chemical Company

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