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February 1999

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Subject:
From:
Gang Zhao <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 3 Feb 1999 15:09:36 -0500
Content-Type:
text/plain
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text/plain (61 lines)
Hi, Teo:

Our comapany produces a microetchant/cleaner for use in the fabarication of
multi-layer printed wiring boards.  It is a H2SO4-H2O2 based formula.  It
takes about 10-20 seconds in dip or spray application to remove all
fingerprints, copper oxides, grease, chromate, arsenate and zinc.  The etch
rate can be easily controlled by the concentration of H2O2 added.  The H2O2
in the solution is also very stable in the solution.  If you allow the bath
to open in the air (no microetchant/cleaner application)for a month, you are
likely to see an increase in the H2O2 concentration. If you would like to
have a sample for a test, please send me your address to
[log in to unmask]

Gary

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Wednesday, February 03, 1999 10:18 AM
To: [log in to unmask]
Subject: [TN] Looking for OFHC copper and cleaner


My company is located in El Paso, and I cannot find any local lab supply
stores
that have "Oxygen Free High Conductivity (OFHC)" copper (75 mm X 25 MM X 1
MM).
Does anybody know who supplies these coupons?  Also, I am trying to find
some
liquid copper cleaner.  Your assistance would be appreciated.

-Thank you,

Teo Tijerina

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