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Copper Etch

Could there be possibly any chemicals that could be an alternative in etching copper rather than a combination of Phosporic Acid and Nitric acid? The copper thickness is only around 0.2 micron.

Nanett Balilo
- Sunnyvale, California, USA
2002

Have you tried ferric chloride ⇦ this on eBay or Amazon [affil links] ?

Neil Bell
Albuquerque, New Mexico
2002

There are many choices for copper that thin. The easiest is sodium persulphate at ~1/2 lb/gal. w/ about 5% H2SO4. You could also use a peroxide/sulfuric solution. Both are easy to control.

Scott Griggs
- Minneapolis, Minnesota
2003

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