- Description : Fine white powder, free from grittiness odorless, slightly hygroscopic
- Solubility : Practically insoluble in water and in ethanol 95 %
- Alkalinity: Complies as I.P./B.P./U.S.P.
- Arsenic : Not more than 4 ppm
- Heavy Metals : Not more than 40 ppm
- Chloride : Note more than 500 ppm
- Sulphate : Not more than 0.5% ppm
- Acid absorption: Not less than 100 ml. of 0.1m Hydrochloric acid required to neutralize 1.0 gm.
- Water soluble salts: Not more than 30 mg per Gm.
- Loss on Ignition : Not less than 17.0% & not more than 34.0%
- Magnesium oxide : Not less than 29.0%
- Silicone Dioxide : Not less than 65.0
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