Etch conditions for Kovar are pretty much the same as Copper with Ferric
Chloride.

A lot of the small houses etch Iron based alloys first with Ferric Chloride,
then finish up etching Copper.

Usually you use 40+ Baume' Ferric Chloride, and the key issue is watching the
HCl, you keep it low to give you good "etch ratios", and higher to increase
speed.

Rudy Sedlak
RD Chemical Company

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