Hi Dwayne:
Cupric chloride will attack stainless steel.
Best regards
Donald Aitken
----- Original Message -----
From: Dwayne Reid
To: Homebrew_PCBs@yahoogroups.com
Sent: Saturday, April 26, 2003 12:54 PM
Subject: Re: [Homebrew_PCBs] Homemade PCB holders for etcher
At 11:09 AM 4/26/03 -0700, Mike Putnam wrote:
>Dwayne,
>Did you find the Ammonium Persulfate to have a short life for production
>work? I did not use it because of the life of the mixture. Was just
>wondering about your experience with it.
>-Mike
We don't do production, only prototypes. But yes - we found that the shelf
life was short (days, weeks) until we covered (sealed) the etch tank while
we were not using the system. That seemed to let us get several months out
of each batch of etch.
Disposal is a minor pain - we asked our local university to help us deal
with spent etchant in a safe and legal fashion and they came up with a
simple neutralization scheme that works well and is very inexpensive.
I'm definitely interested in alternative etch techniques. I find the
discussion on CuCl fascinating and am wondering if I should consider trying
a batch.
But I've read some concern about CuCl attacking stainless steel and am
hoping that someone can tell me if storing and using CuCl in a stainless
steel tank with a stainless steel immersion heater is practical.
Thanks!
dwayne
--
Dwayne Reid <dwayner@...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 19 years of Engineering Innovation (1984 - 2003)
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