Hi all,
has anyone already use sodium metasilicate for development ?
I've read that you can leave your PCB in it without any risk of over-development and it can last for years.
--- On Tue, 10/28/08, Jim Klitzing <wb6myc@...> wrote:
From: Jim Klitzing <wb6myc@...>
Subject: [Homebrew_PCBs] Re: MG Negative Dry Film Resist
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, October 28, 2008, 11:40 PM
FYI,
For most of these dry film resists, I've found that a 15 second
exposure in direct sunlight is about right. Rainy or otherwise cloudy
days ruin the parade, of course.
Allow exposed film to 'age' for at least 10 minutes; then develop with
1/2 TSP sodium carbonate (Arm & Hammer Super Washing Soda) in 8oz of
warm water. Strip with 2 TBS sodium carbonate in 8oz hot water.
I'm getting .010 traces with excellent definition using this
method...your results may require some experimentation from there.
Hope that's helpful, Jim
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