Ni2O3 ( base on Ni% ): 60% min Insoluble substance in hydrochloric acid %: 0.2% max Chloride %: 0.01% max Sulfate %: 0.06 % max Nitrate %: 0.05% max Heavy metal ( base on Cu% ): 0.01% max Fe %: 0.003% max Co %: 0.2% max Alkali and alkaline earth %: 0.3% max