Having a little trouble understanding your question. Kovar is copper clad.
Are you using this stuff in CTE/core boards or what? Used to use in with
Invar, a variation on the them, for LCCC boards.

Talk to TI, as one example. They use it, as some other semi manufacturers,
to etch lead frames. That's where I found out about it over 15 years ago
when using CIC/CCI.

MoonMan

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