How about instead of copper, monocrystalline silicon?
Quote:
https://en.wikipedia.org › wiki › Wafer_(electronics)
Wafer (electronics) - Wikipedia
Wafers are formed of highly pure,[6]nearly defect-free single crystallinematerial, with a purity of 99.9999999% (9N) or higher.[6] One process for forming crystalline wafers is known as the Czochralski method, invented by Polish chemist Jan Czochralski.
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Maybe 0.1% in the control circuits for hydro?