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.
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----- 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]
>
>
>
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