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Magnesium Oxide
BP FCC Food grade
Magnesium oxide

Magnesium Oxide: CAS Number: 1309-48-4, Molecular Formula: MgO, Molecular Weight: 40.30

Specifications of Standard Grade STARMgO#150 of Magnesium Oxide
Moisture(%) 0.5
Loss on Ignition(%) 6.5
MgO *1(%) 98.0
CaO(%) 0.6
Fe(%) 0.02
Al(%) 0.01
Acid Insoluble Substances(%) 0.01
Bulk Density(g/ml) 0.55
Average Particle Size(um) 3.5
Specific Surface Area (BET)(m2/g) 145
Screen Residue (75um)(%) 0.01

*1 Measured after Ignition

We also offer High Purity Magnesium oxide of the Grade HP Series, having consistent stable quality and characteristics.

Heavy Magnesium Oxide BP Grade
Ph Eur
Action and use
Antacid; osmotic laxative.

Content: 98.0 per cent to 100.5 per cent of MgO (ignited substance).

Appearance: Fine, white or almost white powder.
Solubility: Practically insoluble in water. It dissolves in dilute acids with at most slight effervescence.

A. 15 g has an apparent volume (2.9.15) before settling of not more than 60 ml.
B. Dissolve about 15 mg in 2 ml of dilute nitric acid R and neutralise with dilute sodium hydroxide solution R. The solution gives the reaction of magnesium.
C. Loss on ignition (see Tests).

Solution S: Dissolve 5.0 g in a mixture of 30 ml of distilled water and 70 ml of acetic acid, boil for 2 min, cool and dilute to 100 ml with dilute acetic acid. Filter, if necessary, through a previously ignited and tared porcelain or silica filter crucible of suitable porosity to give a clear filtrate.
Appearance of solution: Solution S is not more intensely coloured than reference.
Soluble substances: Maximum 2.0 per cent.
To 2.00 g add 100 ml of water R and boil for 5 min. Filter whilst hot through a sintered-glass filter (40) (2.1.2), allow to cool and dilute to 100 ml with water R. Evaporate 50 ml of the filtrate to dryness and dry at 100-105 °C. The residue weighs a maximum of 20 mg.
Substances insoluble in acetic acid: Maximum 0.1 per cent.
Any residue obtained during the preparation of solution S, washed, dried, and ignited at 600 ±50 °C, weighs a maximum of 5 mg.
Chlorides: Maximum 0.1 per cent.
Sulphates: Maximum 1.0 per cent.
Arsenic: Maximum 4 ppm, determined on 5 ml of solution S.
Calcium: Maximum 1.5 per cent.
Iron: Maximum 0.07 per cent.
Heavy metals: Maximum 30 ppm.
Loss on ignition: Maximum 8.0 per cent, determined on 1.00 g at 900 ± 25 °C.

Dissolve 0.320 g in 20 ml of dilute hydrochloric acid and dilute to 100.0 ml with water. Using 20.0 ml of the solution, carry out the complexometric titration of magnesium. 1 ml of 0.1 M sodium edetate is equivalent to 4.030 mg of MgO.

Light Magnesium Oxide IP
Light Magnesia
MgO ---- Mol.Wt.40.30
Category: Antacid, Osmotic Laxative.
Description: Very fine, light, white powder, odourless. 15g occupies a volume of about 150ml.
Solubility: Practically insoluble in water, insoluble in ethanol(95%).It dissolves in dilute acids with at most slight effervescence.

Light Magnesium Oxide contains not less than 98.0 per cent and not more than 100.5per cent of MgO, Calculated with reference to the substance ignited at 900°C.
Arsenic; Heavy metals; Sulphates; Calcium; Soluble substances; Substances insoluble in acetic acid ; Loss on ignition :Complies with the requirements stated under Heavy Magnesium Oxide using, where appropriate, solution A and residue R prepared as described therein.
Colour of Solution: Prepare Solution A and residue R as described in the test for colour of solution under Heavy Magnesium Carbonate. Solution A is not more than intensely Coloured than reference solution.
Iron: Solution complies with the limit test for iron, Appendix 3.13 (0.1%).
Chloride: 4.0ml of solution A complies with the limit test for chlorides, Appendix 3.10(0.125%)

Magnesium Oxide FCC Food grade
MgO Formula wt 40.30
INS: 530 CAS: [1309-48-4]

Magnesium Oxide occurs as a very bulky, white powder, known as Light Magnesium Oxide or as a relatively dense, white powder known as Heavy Magnesium Oxide. Five grams
of Light Magnesium Oxide occupies a volume of approximately 40 to 50 mL, while 5 g of Heavy Magnesium Oxide occupies a volume of approximately 10 to 20 mL. It is soluble in dilute acids, practically insoluble in water, and insoluble in alcohol.

Identification: A solution of sample in 2.7 N hydrochloric acid gives positive tests for Magnesium, Appendix IIIA.
Assay: Not less than 96.0% and not more than 100.5% of MgO after ignition.
Acid-Insoluble Substances: Not more than 0.1%.
Alkalies (Free) and Soluble Salts: Passes test.
Arsenic: Not more than 3 mg/kg.
Calcium Oxide: Not more than 1.5%.
Lead: Not more than 4 mg/kg.
Loss on Ignition: Not more than 10.0%.

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