beryllium copper
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Beryllium Cobalt Copper – ALLOY 10 (UNS C17500)
Beryllium Cobalt Copper – ALLOY 10 (UNS C17500) is a high conductivity beryllium copper that has very similar mechanical properties to Alloy 3. However, this alloy has an additional alloying element of cobalt rather than nickel, giving it a slightly lower thermal conductivity and melting temperature.