Assay % 99.5 – 102.0
pH (5% aq solution) 7.5 – 9.0
Insoluble matter % Max 0.005
Chloride (Cl) % Max 0.001
Nitrogen compounds (N) % Max 0.001
Sulfate (SO4) % Max 0.001
Barium & strontium (as Ba) % Max 0.001
Calcium (Ca) % Max 0.001
Copper (Cu) % Max 0.0002
Iron (Fe) % Max 0.0001
Lead (Pb) % Max 0.0005
Manganese (Mn) % Max 0.001
Potassium (K) % Max 0.001
Sodium (Na) % Max 0.001
Zinc (Zn) % Max 0.0002