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
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