铜Cu+银Ag：≥99.90

锡Sn：≤0.002

锌Zn：≤0.005

铅Pb：≤0.005

铅Pb：≤0.005

镍Ni：≤0.005

铁Fe：≤0.005

锑Sb：≤0.002

硫S：≤0.005

砷As：≤0.002

铋Bi：≤0.001

氧O：≤0.06

注：≤0.1(杂质)

抗拉强度σb (MPa)：≥275

伸长率δ10 (%)：≥5

伸长率δ5 (%)：≥10

注：棒材的纵向室温拉伸力学性能

试样尺寸：直径或对边距离5～40