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• 08:59, 15 February 2022 IsidraLaTrobe9 talk created page Printed Circuit Board Fabrication - Etching Outer Layer (Created page with "<br>The allied discipline of chemical milling (often known as photo-chemical machining, or PCM) has produced some startling analysis into etcher configuration. And while the etchant used was Cupric Chloride, not Ammoniacal Copper etch, what was found ought to apply to the usage of Ammoniacal etch in the PCB industry as nicely. The PCM industry sometimes etches foils which are 5-10 mils thick, and occasionally much thicker than that, consequently etch issue is even more c...")