銅 Cu :76.0~79.0
鋅 Zn:余量
鉛 Pb:≤0.05
磷 P:≤0.02
鋁 Al:1.8~2.3
鐵 Fe:≤0.06
銻 Sb :≤0.05
砷 As :0.03~0.06
鉍 Bi:≤0.002
注:≤0.3(雜質總和)