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Follow BKI Consolidation 2021 Edition Standard - CU1 grade Cu: 52.0 to 62.0 Pb: 0.5 max Fe: 0.5 to 2.5 Sn: 0.1 to 1.5 Zn: 35.0 to 40.0 Al: 0.5 to 3.0 Mn: 0.5 to 4.0 Ni: 1.0 max