Subject: | |
From: | |
Date: | 24 Sep 1996 10:42:26 -0500 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
The original question asked was:
Can anyone post here the formula for Cupric Chloride etch and Ammoniacal
Etch? I know that Hydrochloric Acid and Hydrogen Peroxide are used in
Cupric Chloride etch but I can't find any formula in my personal meager
library.
Thanks...
[log in to unmask]
Reply:
Look in Coombs, Handbook of Printed Circuits 3 rd edition on page 14.15 at
paragraph 14.4.3 for the chemical reactions for cupric . The alkaline
chemistry is on page 14.10.
Hydrochloric acid and Hydrogen peroxide or sodium hypochlorite are listed as
means to regenerate the cupric chloride etchant. Only personnel with proper
equipment and that definitely includes very good ventilation with a fume
scrubber on the ventilation sustem, and more importantly a good
understanding should attempt to do this as the reaction basically involves
the creation of chlorine gas in the solution and you do not want this nasty
chemical in your breathing area Chlorine gas really can kill you, and if it
does not get you when you breath it can cause chemical pneumonia
----------
From: [log in to unmask]
To: [log in to unmask]
Subject: Re: FAB: Formula for Etching
Date: Monday, September 23, 1996 10:10PM
John:
I think you are a little confused, and if you try playing around with HCl
and
peroxide, you are going to die, along with some of the people near you.
Suggest that you look at the website:
http://www.pcbfab.com
and look up the sections on etching, both innerlayer and outerlayer.
This may assist in understanding what the chemistry of the etchants is all
about.
Your inquiry sounded like you want to make your own, and if so, read
carefully, and be real real careful. This stuff can kill.
Good luck
Rudy Sedlak
RD Chemical Company
[log in to unmask]
phone 415-962-8004
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
|
|
|