MAGNESIUM HYDROXIDE Extra Pure

Conforms to BP, IP specification
Milk of magnesia

COAs

Packings

1000 g (01000)

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Article No.	4469H	Grade	Extra Pure
Purity	95%	CAS No.	1309-42-8
Molecular Formula	Mg(OH)₂	Molecular Weight	58.53
H.S. Code	2816.1010	Shelf Life	60 Months

Physical Properties

Physical state at 20 °C	Solid	Colour	White powder
Odour	Odorless	pH value	9.5 - 10.5
Melting point/ Freezing point [°C]	350°C	Density [g/cm3]	2.36
Solubility in water [% weight]	Insoluble in water

Specifications

Appearance	White powder	Assay (complexometric)	95 - 100.5%
Identity	Passes test	Appearance of solution	Passes test
Substance soluble in water	Max 1%	Substance insoluble in acetic acid	Max 0.1%
Chloride (Cl)	Max 0.1%	Sulphate (SO4)	Max 0.5%
Heavy metal (as Pb)	Max 0.003%	Arsenic (As)	Max 0.0004%
Calcium (Ca)	Max 1.5%	Loss on ignition (at 900°C)	30 - 32.5%
Iron (Fe)	Max 0.07%

Revision Date: 10-Aug-2026

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