This is what I use. 2 parts peroxide, one part muriatic acid
http://www.instructables.com/id/Stop-using-Ferric-Chloride-etchant!--A-better-etc/step2/Put-the-Lime-in-the-Coconut/?f=m
Sent from my iPhone
On May 15, 2012, at 6:12 AM, Donald H Locker <dhlocker@...> wrote:
> Sorry, I didn't write the formula and it was over five years ago. I do recall I purchased the H2O2 from Sally Beauty Supply. I can look up the product label this evening. Maybe I wrote the formula I used somewhere.
>
> Donald.
> --
> ∗Plain Text∗ email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ ascii ribbon campaign - <www.asciiribbon.org>
>
> ----- Original Message -----
> > From: "Spencer W" <upnxwood16@...>
> > To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> > Sent: Monday, May 14, 2012 9:26:18 PM
> > Subject: Re: [Homebrew_PCBs] Re: Slow Etch?
> > What ratio are you using? I would love to increase my etch times
> >
> > Sent from my iPhone
> >
> > On May 14, 2012, at 6:59 PM, Donald H Locker <dhlocker@...>
> > wrote:
> >
> > > I tried HCl with H2O2 (30%HCl with 30-volume H2O2 (about 9%, IIRC))
> > > -- etched 1oz on FR4 fully in less than 10 minutes at room
> > > temperature.
> > >
> > > Donald.
> > > --
> > > ∗Plain Text∗ email -- it's an accessibility issue
> > > () no proprietary attachments; no html mail
> > > /\ ascii ribbon campaign - <www.asciiribbon.org>
> > >
> > > ----- Original Message -----
> > > > From: "Confidential" <scuba840@...>
> > > > To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> > > > Sent: Monday, May 14, 2012 7:50:59 PM
> > > > Subject: Re: [Homebrew_PCBs] Re: Slow Etch?
> > > > We've tried 10oz copper a with Hcl/H2O2 on a ceramic dielectric.
> > > > After
> > > > several hours it was only about half way done. The addition of the
> > > > PCB
> > > > fab-in-a-box "TRF" gave us significantly better toner etchant
> > > > resistance.
> > > >
> > > >
> > > > I'll remember the bubbler trick the next time.
> > > >
> > > >
> > > > -N
> > > >
> > > >
> > > >
> > > > ________________________________
> > > > From: Leon Heller <leon355@...>
> > > > To: Homebrew_PCBs@yahoogroups.com
> > > > Sent: Monday, May 14, 2012 11:31 AM
> > > > Subject: Re: [Homebrew_PCBs] Re: Slow Etch?
> > > >
> > > >
> > > >
> > > > On 14/05/2012 19:24, Spencer wrote:
> > > > > I use the same solution and noticed heating doesnt help either.
> > > > > The
> > > > > biggest improvement in time that I get with my board came from
> > > > > sticking
> > > > > an aquarium air pump and with a hose with a bunch of holes that
> > > > > I
> > > > > did
> > > > > from a sewing needle into the solution. I get about 45 minute
> > > > > etch
> > > > > time
> > > > > now with my 1oz boards.
> > > >
> > > > When I tried HCl and H2O2 it was very fast, with no heating.
> > > > Concentrated HCl is required,
> > > >
> > > > Leon
> > > > --
> > > > Leon Heller
> > > > G1HSM
> > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > > >
> > > >
> > > > ------------------------------------
> > > >
> > > > Be sure to visit the group home and check for new Links, Files,
> > > > and
> > > > Photos:
> > > > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Be sure to visit the group home and check for new Links, Files, and
> > Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
>
[Non-text portions of this message have been removed]