銅 Cu :63.5~68.0 鋅 Zn:余量 鉛 Pb:≤0.03
鉛 Pb:≤0.03
硼 P:≤0.01
鐵 Fe:≤0.10
鈹 Sb :≤0.005
鉍 Bi:≤0.002
注:≤0.3(雜質(zhì))