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Follow ASTM Standard - C84400 or usually known as Valve Metals grade Cu: 78.0 to 82.0 Pb: 6.0 to 8.0 Fe: 0.4 max Sn: 2.3 to 3.5 Zn: 7.0 to 10.0 Al: 0.005 max Ni: 1.0 max P: 0.02 max Si: 0.005 max Sb: 0.25 max S: 0.08 max
