High concentration sodium permanganate etch batch and its use in desmearing and/or etching printed circuit boards

摘要

Aqueous, alkaline, liquid solutions consisting essentially of NaMnO4 and NaOH provide high etch rates for, e.g., printed circuit boards. The solutions can be used to desmear and etchback, and produce manganese residues on the surface of the board which are readily removed by acid neutralization alone.