Alt-BEAM Archive
Message #00802
To: jth@crack.biochem.ualberta.ca, beam@corp.sgi.com
From: "James Niemasik" niemasik@hotmail.com
Date: Mon, 22 Feb 1999 15:13:55 PST
Subject: [alt-beam] Re: Etching PCB's
Ferric Chloride and Ammonium Persulfate (not sure about the second one,
I've never used it) are the common etching chemicals. I've only seen
ferric chloride in liquid form, ready-to-go, but ammonium persulvate is
commonly sold in crystal form and must be mixed with water first. The
length of time needed to etch depends on the size of the board, the
warmth and copper content of the etchant, and how much you agitate the
etchant while it's etching. It can take as little as a few minutes or as
long as half an hour.
Hope this helps.
--
* James Niemasik
* jfn@best.com
* James' BEAM Robotics Page:
* http://welcome.to/jamesbeam
Note: "niemasik@hotmail.com" is an account I use only for sending
messages from school and when I'm on the road, please reply to
"jfn@best.com" if possible.
>Date: Mon, 22 Feb 1999 11:49:47 -0700
>From: Torin Huzil
>To: beam
>Subject: Etching PCB's
>Reply-To: Torin Huzil
>
>Hi there, I was wondering if anyone knew what the chemical used for
>etching circuit boards was? I just read that it was either Ferric
>Chloride or APS? Also does anyone know what the concentration of these
>echants are and if they are just made in a solution of water or some
>kind of acid? Also how long do you let it sit on your board for?
>
>Thanks
>Torin
>
>
______________________________________________________
------------------------------------------------------------------------
eGroup home: http://www.eGroups.com/list/alt-beam
Free Web-based e-mail groups by eGroups.com
Home