Magnesium Oxide BP

Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium.  Based on bulk density it can be classified into heavy and light.


It is used as an antacid and mild laxative. Used as a food additive.


Product Name: Magnesium Oxide
Molecular Formula: MgO
Molecular Weight: 40.30 g/mol
CAS No.: 1309-48-4



Test Specification
Characters It occurs as a fine, white or almost white powder

Test A

Test B

Test C


(a)   Bulk density – not more than 0.25 g/mL.

(b)   Specified test. The solution gives the reaction of magnesium

(c)   Loss on ignition- Not more than 8.0%

Solubility Practically insoluble in water. It dissolves in dilute acids with at most slight effervescence.
Appearance of solution The solution is not intensely colored than reference solution B3
Arsenic Not more than 4 ppm
Heavy Metals Not more than 30 ppm
Iron Not more than 0.07%
Chlorides Not more than 0.1%
Sulfates Not more than 1.0%
Calcium Not more than 1.5%
Soluble substances Not more than 2.0 %
Substances insoluble in acetic acid Not more than 0.1%
Loss on ignition Not more than 8.0%
Assay Not less than 98.0% and more than 100.5% of MgO (ignited substance)


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


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We observe WHO Good manufacturing practice and Good laboratory practice.

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