Assay------------------------------------99.80%min.
Insolution substance in water------------0.01%max.
Loss on drying---------------------------1.0%max.
Chloride---------------------------------0.002%max.
Sulphate---------------------------------0.005%max.
Nitride----------------------------------0.001%max.
Phosphated and silicated ash-------------0.006%max.
Magnesium--------------------------------0.002%max.
Aluminum---------------------------------0.003%max.
Potassium--------------------------------0.005%max.
Calcium----------------------------------0.01%max.
Iron-------------------------------------0.0005%max.
Heavry metal-----------------------------0.00005%max.
Boron------------------------------------0.00005%max.
Phosphorus-------------------------------0.0001%max.