Assay (complexometric): ≥ 97 %

Substances soluble in water: ≤ 0.5 %

Substances insoluble in hydrochloric acid: ≤ 0.10 %

Carbonate (as CO₂): ≤ 1.5 %

Chloride (Cl): ≤ 0.01 %

Sulfate (SO₄): ≤ 0.02 %

Total nitrogen (N): ≤ 0.002 %

Ca (Calcium): ≤ 0.10 %

Cu (Copper): ≤ 0.001 %

Fe (Iron): ≤ 0.005 %

K (Potassium): ≤ 0.005 %

Na (Sodium): ≤ 0.30 %

Pb (Lead): ≤ 0.001 %

Zn (Zinc): ≤ 0.0005 %

Barium and Strontium (as Ba): ≤ 0.005 %

Loss on ignition (1000 °C): ≤ 3.0 %