| Assay | : | Min.99.5 % | 
| pH ( 20' c; 5 %) | : | 8.6 to 9.8 | 
| Insolubility in water | : | Max. 50 ppm | 
| CI (CHLORIDE) | : | Max. 10 ppm | 
| SO4 (sulphate) | : | Max. 100 ppm | 
| Ca ( Calcium) | : | Max. 50 ppm | 
| Cu ( Copper ) | : | Max 10 ppm | 
| Fe ( Iron) | : | Max. 15 ppm | 
| Na ( sodium ) | : | Max 0.03% | 
| Pb ( Lead) | : | Max 50 ppm |