Magnesium Hydroxide IP

CAS  No. : 1309-42-8
Molecular Formula : Mg(OH)2
Molecular Weight  : 58.32 gm/mol
Category : Antacid; Osmotic laxative
Storage Condition : Store protected from moisture
Source : IP-2010, Vol-2, Page No.1622

Application

Widely used as an Antacid in many formulations. Also used as intermediate for obtaining magnesium metal, residual fuel oil additive, sulfite pulp, uranium processing, dentifrices, in food as alkali, drying agent, color retention agent, frozen deserts. Also widely used in Effluent Treatment Plant especially where the Effluents is very much alkaline in nature.

Sr. No. Test Parameters Specification / Limits
1 Description A Bulky white powder
2 Solubility Practically insoluble in water and in ethanol (95%). It dissolves in dilute acids.
3 Identification Reaction A for Magnesium salt
4 Appearance of solution Not more intensely than Ref.sol BS3
5 Arsenic Not more than 4 ppm
6 Heavy Metals Not more than 30 ppm
7 Chloride Not more than 0.1 %
8 Sulphate Not more than 0.5 %
9 Calcium     Not more than 1.5 %
10 Iron                 Not more than 0.08 %
11 Soluble substances       Not more than 10 mg.  
12 Substances insoluble    in Acetic Acid Not more than 5 mg
13 Loss on ignition Between 30.0 % to 32.5 %
14 Assay as Mg(OH)2 Between 95 % to 100.5 % of Mg(OH)2

Magnesium Hydroxide USP

CAS  No.

:

1309-42-8

Molecular Formula

:

Mg(OH)2

Molecular Weight 

:

58.32 gm/mol

Storage Condition

:

Preserve in tight container

Source

:

USP-34, Page No.3365

Application

Widely used as an Antacid in many formulations. Also used as intermediate for obtaining magnesium metal, residual fuel oil additive, sulfite pulp, uranium processing, dentifrices, in food as alkali, drying agent, color retention agent, frozen deserts. Also widely used in Effluent Treatment Plant especially where the Effluents is very much alkaline in nature.

Sr. No. Test Parameters Specification / Limits
1 Description A Bulky white powder
2 Solubility Practically insoluble in water and in alcohol. Soluble in dilute acids.
3 Identification - A Reaction for Magnesium salt
4 Microbial Limits:
E-Coli
Absent per gm
5 Loss on Drying Not more than 2 %, Dry at 105°
6 Loss on Ignition Between 30% to 33%, ignited at 800°
7 Soluble salts Not more than 10 mg
8 Carbonate Not more than slight effervescence is observed
9 Limit of Calcium    Not more than 1.5%
10 Heavy Metals                 Not more than 20 µg per gm
11 Limit of Lead      Not more than 0.00015 %  
12 Assay as Mg(OH)2
(Dried Basis)
Between 95 % to 100.5 % of Mg(OH)2

Magnesium Hydroxide BP

CAS  No.

:

1309-42-8

Molecular Formula

:

Mg(OH)2

Molecular Weight 

:

58.32 gm/mol

Source

:

BP-2013

Application

Widely used as an Antacid in many formulations. Also used as intermediate for obtaining magnesium metal, residual fuel oil additive, sulfite pulp, uranium processing, dentifrices, in food as alkali, drying agent, color retention agent, frozen deserts. Also widely used in Effluent Treatment Plant especially where the Effluents is very much alkaline in nature.

Sr. No. Test Parameters Specification / Limits
1 Description White fine amorphous Powder.
2 Solubility Practically insoluble in water. It dissolves in dilute acids.
3 Identification: (A)
(B)
Reaction A for Magnesium salts.
As per loss on ignition test.
4 Appearance of solution
(solution-S)
Not more intensely colored than Ref.sol B3
5 Soluble substances Not more than 20 mg
6 Substance insoluble in Acetic Acid Not more than 5 mg
7 Arsenic Not more than 4 ppm
8 Heavy Metals Not more than 30 ppm
9 Chloride     Not more than 0.1 %
10 Sulphate                Not more than 0.5 %
11 Calcium       Not more than 1.5 %
12 Iron Not more than 0.07 %
13 Loss on ignition Between 29.0 % to 32.5 %
14 Assay as Mg(OH)2 Between 95 % to 100.5 % of Mg(OH)2

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