Magnesium Oxide (MgO) CAS 1309-48-4

What Is Magnesium Oxide?

Magnesium Oxide, commonly known as magnesia or MgO, is a white inorganic powder produced from magnesium-containing raw materials through controlled calcination.

Its alkalinity, thermal stability, reactivity and magnesium content make it suitable for environmental treatment, rubber, plastics, ceramics, refractories, construction materials, agriculture and other industrial applications.

Different Magnesium Oxide grades can have the same chemical formula but very different bulk density, particle size and reactivity.

Magnesium Oxide Product Information

Available Magnesium Oxide Grades

Light Magnesium Oxide

Light Magnesium Oxide has relatively low bulk density and a bulky powder structure. It is selected where surface area, dispersion or higher apparent volume is important.

Heavy Magnesium Oxide

Heavy Magnesium Oxide has higher bulk density and generally better powder flow. It is useful where compact handling, tableting or controlled loading is required.

“Light” and “heavy” describe physical density, not necessarily product purity.

Active Magnesium Oxide

Active or caustic-calcined Magnesium Oxide is produced under controlled calcination conditions to maintain higher chemical reactivity. It is commonly evaluated for rubber, environmental treatment and specialty chemical processes.

Dead-Burned Magnesia

Dead-burned magnesia has lower reactivity and greater high-temperature stability. It is primarily used in refractory bricks, furnace linings and other high-temperature materials.

High-Purity Magnesium Oxide

High-purity grades provide controlled metallic impurities, particle size and surface properties for ceramics, electronic materials, catalysts and other demanding applications.

Which Magnesium Oxide Specifications Should Buyers Compare?

The product name and MgO assay alone are not sufficient for grade selection.

Final limits should be confirmed through the agreed specification and batch Certificate of Analysis.

Main Magnesium Oxide Applications

Environmental and Water Treatment

Reactive MgO can be used to neutralize acidic streams and support pH control. The required grade depends on reaction time, water chemistry and treatment equipment.

Rubber and Plastics

Selected active grades function as acid acceptors, curing activators or functional fillers in rubber and polymer formulations.

Refractories and Ceramics

Dead-burned and high-purity MgO grades are used in refractory bricks, furnace linings, crucibles and technical ceramics.

Construction Materials

Magnesium Oxide can be used in magnesium-based cement, boards, flooring and specialty construction formulations.

Agriculture and Animal Feed

Approved feed or agricultural grades provide a magnesium source for animal nutrition, fertilizer and soil-treatment applications.

Food and Pharmaceutical Products

Only appropriately certified food or pharmaceutical grades should be used for nutritional, food-processing or medicinal applications. Industrial grades are not suitable substitutes.

How to Select the Right Magnesium Oxide Grade

Before ordering, confirm:

• Required MgO content

• Light or heavy grade

• Required reactivity

• Particle-size range

• Bulk density

• Maximum CaO, SiO₂ and iron limits

• Intended application

• Required regulatory standard

• Packaging and annual quantity

Samples should be tested in the customer’s formulation or production process before changing grades.

Packaging and Storage

Magnesium Oxide is commonly supplied in lined moisture-resistant bags or bulk bags. Packaging options should be confirmed during quotation.

Store the material in a cool, dry and ventilated area. Keep bags tightly closed because MgO can absorb moisture and carbon dioxide from the air.

Avoid creating airborne dust. Use suitable respiratory, eye and hand protection according to the current Safety Data Sheet.

Why Source Magnesium Oxide from AOZUN?

AOZUN supports international buyers with Magnesium Oxide grade selection, specification confirmation, samples, export packaging and shipment documentation.

Available documents may include:

• Technical Data Sheet

• Safety Data Sheet

• Batch Certificate of Analysis

• Packaging information

• Country-of-origin statement

• Regulatory documentation for the selected grade

For accurate grade selection, provide the intended application, purity, reactivity, particle size, quantity and destination country.

Magnesium Oxide FAQs

Is Magnesium Oxide organic or inorganic?

Magnesium Oxide is an inorganic compound and an alkaline-earth metal oxide.

Is light Magnesium Oxide purer than heavy Magnesium Oxide?

Not necessarily. Light and heavy describe bulk density and powder structure rather than purity.

Is Magnesium Oxide soluble in water?

MgO is practically insoluble in water, but it reacts with acids and can slowly hydrate under suitable conditions.

Can one MgO grade be used for every application?

No. Refractory, rubber, feed, food, pharmaceutical and electronic applications require different purity, density, reactivity and regulatory standards.

Request a Magnesium Oxide Quote

Contact AOZUN for Magnesium Oxide specifications, samples, COA, SDS, packaging options and commercial pricing.

Please include the required grade, purity, particle size, reactivity, order quantity and destination country.