PURITY ( ON DRY BASIS)

99.5% MIN

MOISTURE

1.0% MAX

MOISTURE

0.3% MAX

IRON

0.2% MAX

HEAVY METAL (AS Pb)

0.0005% MAX

WATER-INSOLUBLE

0.02% MAX.

SULPHATES

0.03% MAX.

PH VALUE

4.2-5.8