Lega di rame e zinco. Gli O. si contraddistinguono con un numero progressivo che indica il loro tenore in rame (sigla UNI: OT60, al 60% di rame; OT63, al 63% di rame; OT72, al 72% di rame). L’O. è impiegato per la fabbricazione di oggetti ornamentali o di arredo, di pezzi meccanici, rubinetterie, parti statiche di imbarcazioni perché resistente all’acqua marina, ecc.
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