Etching Solutions.

CircuiTree | June 1, 2001| | Copyright

edited from EPA-744-R-98-003

Etching is required for any of the process alternatives within the subtractive process. Panels entering the etch process have been coated with an etch resist, usually a dry film photoresist. The resist layer selectively protects the circuit areas from etchant, whereas the remaining copper foil is etched away.

Etchant sprayed onto the surface of the panel removes the exposed copper, but cannot significantly dissolve the copper residing under the resist. In this way, a copper circuit is formed. Etching is performed with ...

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