Solubility |
Insoluble in water, almost completely soluble in dilute hydrochloric acid. |
Magnesium Oxide Contents
(As MgO )
|
Not less than 14.0 % and not more than 18.0%, calculated with reference to the substance ignited at
1000’C.
|
Aluminium Oxide Contents
( As Al2O3)
|
Not less than 20.0 % and not more than 25.0%, Calculated with Reference to the substance ignited at
1000’C
|
Silicon Dioxide Contents
( As SiO2 )
|
Not less than 48.0% and not more than 58.0%, Calculated with Reference to the substance ignited at
1000’C
|
Total Contents of Magnesium
Oxide, Aluminium Oxide and
Silicon Dioxide
|
Not less than 88 %
|
Loss On Ignition |
Not less than 20.0% and not more than 30.0% of its weight When ignited at 1000’C |
Heavy Metals |
Not more than 20 ppm. |
Arsenic |
Not more than 8 ppm. |
Chloride |
Not more than 450 ppm. |
Sulphate |
Not more than 0.4% |
Acid Consuming Capacity |
Not less than 175.0 ml/gm of 0.1 NHCl |