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Todd, What are your ratios, particuly the sodium chloride(salt) ?
Ollie k0lqk
--- On Tue, 2/19/13, Todd F. Carney <k7tfc@...> wrote:
From: Todd F. Carney <k7tfc@...>
Subject: Re: [Homebrew_PCBs] Re: Etching woes: Press-n-Peel, Laminator, Etch Tank + Sodium Persulphate
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, February 19, 2013, 11:21 PM
Either ammonium persulfate or sodium persulfate is used by commercial pcb
manufacturers. They do not use ferric chloride, not for decades. Only
hobbyists use the stuff. I'm using a peroxide-muriatic acid-sodium chloride
etchant. It's very cheap, and the chemicals are available either in a drug
store or at places such as Home Depot (for the acid). I use it "one-shot."
I use just enough to do the board I'm etching and then toss it away. It's
that cheap. This way, It works the same way--etch times, etc.--every time I
use it.
73,
Todd
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K7TFC / Medford, Oregon, USA / CN82ni / UTC-8
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