Magnesia cement boards are advanced building materials predominantly made from magnesium compounds. They include two primary types:
Magnesium Oxychloride Cement Board
Known as Sorel cement, this material was invented in 1867 by Sorel. Its main ingredient is magnesium oxide (MgO), combined with magnesium chloride (MgCl₂) as a binding agent. Sometimes called double magnesium cement, it is commonly made using light-burned magnesite powder derived from magnesite ore. We get a durable composite material called FRIM by reinforcing it with glass fibers.
Magnesium Oxysulfate Cement Board
This type differs from magnesium oxychloride boards in the mixing solution, including magnesium sulfate instead of magnesium chloride. Magnesium oxysulfate boards offer similar fire resistance, insulation, and environmental benefits but eliminate the moisture absorption issues seen with magnesium oxychloride boards. Modification with basic magnesium carbonate significantly improves strength and durability.
Key Components
Magnesium Chloride Hexahydrate (MgCl₂·6H₂O)
This compound is a colorless crystal known for its solubility in water and ethanol. It quickly absorbs moisture in humid conditions, which contributes to corrosion risks.
Epsom Salt (Magnesium Sulfate Heptahydrate, MgSO₄·7H₂O)
A white or colorless crystal widely used in magnesium oxysulfate cement boards. It is stable in dry air but loses water molecules when heated.
Corrosion and Durability Factors
Magnesium Oxychloride Cement Boards
When exposed to moisture, MgCl₂·6H₂O absorbs water and causes electrochemical corrosion on metals, particularly carbon steel. This reaction produces rust, which can weaken the metal over time.
Magnesium Oxysulfate Cement Boards
Unlike magnesium oxychloride, magnesium sulfate does not corrode carbon steel, making it a safer option for environments with metal structures.
MagMatrix Sulfate Magnesia Cement Board
MagMatrix has developed an innovative chloride-free solution for magnesia cement boards. By modifying the material with basic magnesium carbonate and phosphate fillers, these boards offer:
Low moisture content (3.7%)
Minimal chloride ion dissolution (0.021%)
High fire resistance with enhanced structural durability
The advanced formula prevents corrosion on steel and eliminates the risks associated with chloride ions, ensuring long-lasting performance.
Benefits of Magnesium Oxysulfate Cement Boards
Fire Resistance
It provides excellent fire protection, making it ideal for construction and passive fireproofing solutions.
Durability
Resistant to moisture and corrosion, ensuring a longer lifespan even in harsh environments.
Eco-Friendly
Made with non-toxic materials and sustainable processes, reducing environmental impact.
Application Insights
Magnesium oxysulfate cement boards are the optimal choice for projects requiring superior fire resistance, structural integrity, and environmental safety. Their stability and minimal impact on metals make them ideal for construction and industrial engineering.
If you are searching for reliable, high-performance magnesia cement board solutions, MagMatrix ensures your buildings are safer, more durable, and eco-conscious.
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