Magnesium Hydroxide

Grades

IP

BP/EP

USP -  NF

Description

Bulky white powder;odorless

White or almost white, fine, amorphous powder

Bulky, white powder

Identification

It gives reactions of magnesium salts

-It gives reactions of magnesium                                     

Responds to the test for magnesium

Solubility

Practically insoluble in water and ethanol (95%)

Practically insoluble in water , it dissolves in dilute acid

Practically insoluble in water and in alcohol; soluble in dilute acids

Arsenic

Max 4 ppm

Max 4 ppm

-

Carbonate

-

-

Not more than a slight effervescence is observed

Chloride

0.1%

Max 0.1%

-

Iron

0.08%

Max 0.07%

-

Heavy Metals

Max 30 ppm

Max 30 ppm

-

Clarity of Solution

Not more intensely coloured than reference solution

Not more intensely coloured than reference solution

-

Limit of lead

-

-

1.5 ppm

Soluble substances

Complies with the requirements

Max  2.0%

-

Substances insoluble in acetic acid

Max 0.1%

Max  0.1%

-

Calcium

1.5%

Max 1.5%

1.5%

Sulphate

0.5%

BP - Max 1.0%  /   EP - Max 0.5%

-

Loss on drying

-

-

Max 2.0%

Loss on Ignition

Between 30.0 to 32.5%

29.0 % to 32.5%

30.0% to 33.0%

Assay Dry Basis

95.0% to 100.5%

95.0% to 100.5%

95.0% to 100.5%