In:99.999%min Cu:0.00004max Pb:0.0001max Cd:0.00005max Tl:0.0001max Sn:0.00013max Zn:0.00005max Fe:0.00005max As:0.00005max Al:0.00005max S:0.0001max Mg:0.00005max Si:0.0001max Ag:0.00005max Ni:0.00005max