Chemical Raw Material
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Magnesium Oxide

Magnesium Oxide

CAS No：1309-48-4

Magnesium Oxide is an odorless, non-toxic, basic inorganic oxide with an ultra-high melting point (2852℃). It is practically insoluble in water and alcohol but dissolves readily in acids and ammonium salt solutions. Depending on calcination temperatures and processing methods, Magnesia is classified into Caustic Calcined Magnesia (CCM), Dead Burned Magnesia (DBM), Fused Magnesia (FM), and Food/Pharmaceutical Grade.

Technical Parameter Reactive Grade (CCM) Refractory Grade (DBM) Pharma / Food Grade Test Method
MgO Assay ≥  85 - 93% ≥  90 - 97.5% ≥  96 - 100.5% GB/T 5069 / USP

Cap Content

 ≤ 1.5 - 2.5% ≤ 1.2 - 2% ≤ 1.5% XRF / Titration
Fe2O3 Content ≤ 0.8%

≤ 1.2%

 ≤ 0.05%  （500 ppm） Spectrophotometry
SiO2 Content ≤ 3.5% ≤ 3.5% ≤ 0.1% GB/T 5069
Loss on Ignition ≤ 3 - 8% ≤ 0.5% ≤ 5% Gravimetric
Reactivity (Citric Acid) 50 - 120 scc —— —— Citric Acid Test
Heavy Metals (as Pb) —— —— ≤ 10 ppm USP / FCC

The uses of magnesium oxide in the industry

 

Refractory materials industry

Refractory materials industry

Magnesium oxide has a melting point as high as 2800℃ and is the core raw material for making high-grade refractory materials like magnesia bricks, mag-chrome bricks, and mag-carbon bricks. It's widely used for linings in smelting furnaces and kilns in industries like steel, cement, and glass, making it the biggest consumer of magnesium oxide, accounting for over 50% of the global market.

 

Silicon steel coating industry

High-purity magnesium oxide is a key insulating coating material for making oriented silicon steel sheets. Once coated, it can reduce eddy current loss, protect the steel sheets from oxidation and decarburization, and maintain excellent electromagnetic performance. It's an essential material for power transformer and motor cores.

Silicon steel coating industry

 

Building Materials Industry

Building Materials Industry

Mixing magnesium oxide with magnesium chloride or magnesium sulfate solution can make magnesium oxychloride cement, which is strong and fire-resistant. It's used to produce new building materials like fireproof boards, insulating partition boards, lightweight partition boards, ventilation ducts, and magnesium tiles.

 

Environmental Protection and Water Treatment Industry

Magnesium oxide is alkaline and has good adsorption properties. It can be used as a neutralizer to treat acidic wastewater and flue gas desulfurization, effectively removing sulfur dioxide and heavy metal ions. It's also used for purifying industrial waste liquids and soil remediation.

Environmental Protection and Water Treatment Industry

 

Rubber and Plastic Industry

Rubber and Plastic Industry

Magnesium oxide is used as a promoter and vulcanization activator for synthetic rubbers like neoprene and fluororubber, which can improve the heat resistance and aging resistance of products. It is also used as a filler and reinforcing agent for plastic and rubber products.

 

Ceramics and electronics industr

High-purity magnesium oxide is used as a raw material for ceramic substrates. It has better thermal conductivity than aluminum oxide and very low dielectric loss. It's also used to make optical glass, transparent ceramic crucibles, insulation fillers for electronic components, and magnetic materials.

Ceramics and electronics industr