Magnesium oxide CAS#1309-48-4

Excellent Thermal Stability: Extremely high melting point (2852 °C) and boiling point (3600 °C), making it suitable for high-temperature and refractory applications.
Strong Alkaline Reactivity: As a typical alkaline earth metal oxide, it readily reacts with acids and ammonium salt solutions, providing effective neutralizing capability.
Versatile Chemical Conversion Ability: Reacts with water to form magnesium hydroxide and with carbon dioxide solutions to produce magnesium bicarbonate, enabling diverse chemical applications.
Abundant & Accessible Raw Materials: Produced from widely available natural resources such as magnesite, dolomite, and seawater, ensuring stable supply and cost efficiency.

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Magnesium Oxide (CAS#1309-48-4)

Magnesium oxide (MgO) is a representative alkaline earth metal oxide. It appears as a white powder with a melting point of 2852 °C, a boiling point of 3600 °C, and a relative density of 3.58 at 25 °C.

It dissolves in acids and ammonium salt solutions. When reacting slowly with water, it forms magnesium hydroxide. It can also dissolve in aqueous carbon dioxide to produce magnesium bicarbonate. Upon exposure to air, it gradually absorbs moisture and carbon dioxide. When heated, it releases irritating fumes.

Magnesium oxide is primarily produced from natural raw materials such as magnesite (MgCO₃), dolomite (MgCO₃·CaCO₃), and seawater.

Magnesium oxide CAS#1309-48-4

Magnesium oxide Chemical Properties

Melting point	2852 °C (lit.)
Boiling point	3600 °C
Bulk density	100kg/m3
Density	3.58
Refractive index	1.736
Fp	3600°C
Storage temp	no restrictions.
Solubility	5 M HCl: 0.1 M at 20 °C, clear, colorless
Form	nanopowder
Color	White
Specific Gravity	3.58
Odor	wh. powd. or cryst., odorless
PH	10.3 (H2O, 20℃)(saturated solution)
Resistivity	1.3 ∞ 10*15 (ρ/μΩ.cm)
Water Solubility	6.2 mg/L (20 ºC), reacts
Semiconductor properties	<111>
Sensitive	Air Sensitive
λmax	λ: 260 nm Amax: ≤0.040
λmax	λ: 280 nm Amax: ≤0.025
Crystal Structure	Cubic
Crystal system	Cube
Merck	145677
Space group	Fm3m
Lattice constant	a/nmb/nmc/nmα/oβ/oγ/oV/nm30.42270.42270.42279090900.0755
Exposure limits	ACGIH: TWA 10 mg/m3
	OSHA: TWA 15 mg/m3
	NIOSH: IDLH 750 mg/m3
Dielectric constant	9.7（0.0℃）
Stability:	Stable. Incompatible with bromine trifluoride, bromine trichloride, phosphorus pentachloride.
Cosmetics Ingredients Functions	ABSORBENT
	OPACIFYING
	BUFFERING
InChI	1S/Mg.O
InChIKey	CPLXHLVBOLITMK-UHFFFAOYSA-N
SMILES	O=[Mg]
Hardness, Mohs	4.0 - 4.5
CAS DataBase Reference	1309-48-4(CAS DataBase Reference)
NIST Chemistry Reference	Magnesium monoxide(1309-48-4)
EPA Substance Registry System	Magnesium oxide (1309-48-4)

Safety Information

WGK Germany	WGK 1
RTECS	OM3850000
TSCA	TSCA listed
HS Code	25199099
Storage Class	11 - Combustible Solids
Hazardous Substances Data	1309-48-4(Hazardous Substances Data)
Toxicity	TCLo inhalation in human: 400mg/m3
IDLA	750 mg/m3

Product Application of Magnesium Oxide (CAS#1309-48-4)

In water treatment applications, magnesium oxide generates a positive charge in aqueous systems, enabling it to attract and adsorb negatively charged suspended particles. This adsorption effect helps enhance overall filtration efficiency.

As an alkaline granular refractory material, it is widely used in the metal refining industry. It can be applied in bulk form as a refractory lining material for furnaces or used as granular material for maintenance purposes. Additionally, it may be applied by spraying or coating onto furnace walls to improve fire resistance and extend furnace service life.

Magnesium oxide CAS#1309-48-4