To solve the corrosion problems of the chloride version, manufacturers replaced Magnesium Chloride with Magnesium Sulfate (MgSO4). This is often called Sulfate MgO Board.
Core Features: It retains the fireproof benefits of MgO board but is Chloride-Free.
The Biggest Advantage: Non-corrosive. It does not cause steel nails or metal frames to rust, and it does not "sweat" or leach moisture even in high humidity.
Stability: It is physically more stable in wet conditions and generally has a longer service life in modern construction.
Achieves a Class A1 non-combustible rating. It produces zero flame spread and non-toxic smoke when exposed to fire, providing the highest level of safety for your buildings.
Features exceptional water and moisture resistance. It effectively prevents water penetration and the growth of mold or fungus, even in extreme climates or high-humidity environments.
Made from natural, non-toxic materials (low formaldehyde emission). Its carbon footprint is significantly lower than traditional building materials like cement, making it a truly sustainable choice.
Offers outstanding structural strength and impact resistance. It can withstand harsh weather conditions, significantly extending the building's lifespan and reducing long-term maintenance costs.
Highly prefabricated and easy to cut and install. It is universally compatible with mainstream building systems like light gauge steel and wood frames, greatly reducing construction time and labor costs.
Thanks to its high density and solid structure, it provides exceptional soundproofing. It effectively reduces noise transmission between rooms or from the outside, creating a quieter and more comfortable indoor environment.
Both materials are categories of Magnesium Oxide Boards (often referred to as MgO Boards or Magnesia Boards). While they look similar, their chemical formulas and performance characteristics—especially regarding moisture—are quite different.
| Feature | MgO Board (Chloride-based) | MgSO4 Board (Sulfate-based) |
|---|---|---|
| Main Ingredients | MgO + MgCl₂ | MgO + MgSO₄ |
| Corrosiveness | High (corrodes metal fasteners) | None (Safe for metals) |
| "Sweating" Risk | High in humid areas | None (Stays dry) |
| Strength | Very High | High (slightly lower than Chloride) |
| Cost | More affordable | Higher |
| Best Use Case | Dry indoor areas, temporary walls | High-end fire doors, steel structures, humid climates |
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