DATAK: ER-21
Dry concentrated Ferric Chloride. A dry powder that is mixed with water to produce a liquid used to remove the excess copper from PC board material. 1/4 lb. will makeup 1 pint of etchant solution. 1 pint will etch approx. 200sq/in of 1 oz. copper single side board. NOTE: Must be mixed/stored/used in glass or plastic containers NO metal!
