platinum-iridium alloy

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platinum-iridium alloy [′plat·ən·əm ə′rid·ē·əm ′al‚ȯi]

(metallurgy)

An alloy with 1-30% iridium; as concentration of iridium increases, so do hardness, chemical resistance, and melting point; used in jewelry, electrical contacts, and hypodermic needles.

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platinum-rhodium alloy
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