Letter 30019

Subtractive etching of fine pitch circuits  

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I would like to know how to do subtractive etching of a 30 micron pitch circuit? Any additive or process condition that would help the etch factor? Also, when I etch with CuCl₂ solution the copper leads look wavy at bottom side, but quite straight at top side.

David L
flex circuit manufacture - Austin, Texas, US

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