Content |
99.5% Min |
Insoluble matter in water |
0.005% Max |
Residues on ignition (As sulphate) |
0.01% Max |
Sulphate (As SO4) |
0.01% Max |
Heavy metal (Pb) |
10ppm Max |
Iron (Fe) |
5ppm Max |
Chloride (Cl) |
0.001% Max |