Sr.No Characteristic Requirement for
Grade i Grade ii
1 Sodium chloride (as nacl)percent by mass, min. 99.5 98.5
2 Matter insoluble in water percent by mass, max. 0.05 0.2
3 Calcium salts (as ca)percent by mass, max. 0.03 0.2
4 Magnesium salts (as mg) percent by mass, max. 0.01 0.10
5 Sulphate (as so4)percent by mass, max. 0.2 0.6
6 Iron compound (as fe) ppm max. 10.0 20.0
The moisture content shall not be more than 1% by mass for grade 1 & 4% by mass for grade
Food grade specification :
Appearance (color) white
Appearance (form) powder
Titration with agno3 99.0 - 101.5 %
Insoluble matter <_ 0.005 %
Ph 5.0 - 9.0
Iodide <_ 0.002 %
Bromide <_ 0.01 %
Chlorate and nitrate (as no3) <_ 0.003 %
Phosphate <_ 5 ppm
Sulfate <_ 0.004 %
Barium pass
Calcium (ca) <_ 0.002 %
Magnesium (mg) <_ 0.001 %
Heavy metals (as lead) <_ 5 ppm
Iron (fe) <_ 2 ppm
Potassium (k) <_ 0.005 %
Solubility (color) colorless
Solubility (turbidity) clear
100 mg/ml h2o.
Standard packing 50kg woven sacks.
Appearance -- White Crystal
Formula -- MgSO4.7H2O
Molecular wt -- 246
Assay – purity 98 % 99 %
Magnesium, Mg 9.4 % 9.5 %
Sulphur, S 12.6 % 12.7 %
Heavy Metals
Arsenic, As 1 ppm 1 ppm
Mercury, Hg 1 ppm not detected
Lead, Pb 1 ppm 1 ppm
Cadmium, Cd 1 ppm not detected
Standard packing 50kg woven sack with inner liner
