can anyone help me please, i have some questions concerning polyimide pcbs :-

1/ what type of inner layer oxidation is recommended / suitable for polyimide e.g. black, brown, red, reduced etc. ?

2/ what type of hole desmear is recommended / suitable for polyimide ?

3/ we have produced some trial pcbs and are getting slight hole wall pullaway - any ideas as to what might be causing this ?

best regards, deron pirie.

Deron Pirie
Irlandus Circuits Ltd.

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