●化学成份：铜+银CuAg：≥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铍Sb：≤0.002硫S：≤0.005***As：≤0.002铋Bi：≤0.001氧O：≤0.06注：≤0.1(杂质)●力学性能：抗拉强度σb(MPa)：≥275伸长率δ10(％)：≥5伸长率δ5(％)：≥10)