Nickel (Ni): 23%min, 23%min
Cobalt (Co): 0.1%ax, 0.5%max
Copper (Cu): 0.0008%max, 0.0008%max
Iron (Fe): 0.0008%max, 0.0008%max
Lead (Pb): 0.0005%max, 0.0005%max
Zinc (Zn): 0.0005%max, 0.0005%max
Sulfate (SO4): 0.05%max, 0.05%max
Chloride (Cl-): 0.005%max, 0.005%max
Water insoluble: 0.2%max, 0.2%max.