Assay (alkalimetric): ≥ 99.5 %

Insoluble matter: ≤ 0.001 %

pH-value (5 %; water, 25 °C): 5.0 - 6.0

Chloride (Cl): ≤ 0.0003 %

Nitrate (NO₃): ≤ 0.001 %

Phosphate (PO₄): ≤ 0.0005 %

Heavy metals (ACS): ≤ 0.0005 %

Heavy metals (as Pb): ≤ 0.0005 %

Al (Aluminium): ≤ 0.000075 %

As (Arsenic): ≤ 0.00002 %

Ca (Calcium): ≤ 0.001 %

Cd (Cadmium): ≤ 0.0001 %

Cr (Chromium): ≤ 0.000075 %

Cu (Copper): ≤ 0.0002 %

Fe (Iron): ≤ 0.0002 %

Mg (Magnesium): ≤ 0.0005 %

Pb (Lead): ≤ 0.0002 %

Zn (Zinc): ≤ 0.0001 %

Residue on ignition (as sulfate): ≤ 0.005 %

Loss on Drying (105 °C): ≤ 0.1 %

Corresponds to ACS,ISO,Reag. Ph Eur