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| From [log in to unmask] Tue Jun 17 11: |
11:05 1997 |
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| >From willli Fri Jun 13 10: |
01:44 1997 |
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John
I have experiencied the same issue. We found Atotech's AFR-3 chromate
remover to work extremely well, give them a call.
Good Luck!
Carlos Aguilar
Wet Process Engineer
______________________________ Reply Separator _________________________________
Subject: FAB: Etching Double-Treat foil.
Author: [log in to unmask] at SMTPLINK-HADCO
Date: 6/12/97 4:09 PM
TechNet:
We have been experiencing problems etching double-treat copper. Specifically,
we have been leaving a fairly large foot at the base of the circuit. In
addition to the obvious problems, this makes AOI very difficult due to the
difference in reflective properties of the treated copper vs. bare copper at
foot.
If the speed is slowed enough to remove the foot, we generally over-etch the
circuits.
We use an ammoniacal etch and have also tried dipping the layers in a 10% HCl
solution to break down the surface treatment prior to etch.
Any suggestions would be appreciated.
Thanks,
John Lennox
Process Engineer
Eastern Manufacturing Corp.
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