pb 99.994～99.997%max Ag 0.00015～0.0005% Cu 0.00031～0.001% Bi 0.00073～0.0027% As 0.0002 ～0.0003% Sb 0.0002～＜0.0003% Sn 0.0001～＜0.0002% Zn 0.0002～＜0.0003% Fe 0.0001～＜0.0003%