铜+银Cu+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

铍Sb：≤0.002

硫S：≤0.005

砷As：≤0.002

铋Bi：≤0.001

氧O：≤0.06

注：≤0.1(杂质)