set copper

set copper

[′set ′käp·ər]
(metallurgy)
An intermediate copper product obtained at the end of the oxidizing portion of the fire-refining cycle and containing about 3-4% cuprous oxide.
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They neglect a number of other factors that cast doubt on the wisdom and merit of Phelps Dodge's actions, notably the company's historic pattern of anti-union behavior and the extraordinary increases in union work force productivity that set copper apart from "endangered" industries like steel.