Homebrew PCBs

What ratio are you using? I would love to increase my etch times

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On May 14, 2012, at 6:59 PM, Donald H Locker <dhlocker@comcast.net> 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.
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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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> > 
> > 
> > 
> 
> 
> 
> 
> 
>  

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