Currently, there are two types of mgo boards on the market: Magnesium Chloride Boards and Magnesium Sulfate Boards. Both are building materials based on magnesium oxide (MgO), but they differ in raw materials, performance, and applications.

1. Raw Materials

• Magnesium Chloride Boards
  The main raw materials are magnesium oxide (MgO) and magnesium chloride (MgCl₂). Magnesium chloride acts as a binding material, combined with reinforcing fibers and other fillers.
• Magnesium Sulfate Boards
  The main raw materials are magnesium oxide (MgO) and magnesium sulfate (MgSO₄).
• Click HERE to see the raw materials of mgo board

2. Moisture Resistance

• Both materials are moisture resistant, but they are not waterproof.
• Magnesium chloride boards, if poorly manufactured — with substandard materials, incorrect formulas, or insufficient curing — and without proper soaking treatment, may develop salt efflorescence in humid environments. This can corrode steel and damage other construction materials.
• At Suparna, we use an advanced water-immersion or soaking technique to eliminate excess chloride ions, ensuring our chloride-based boards remain stable and safe even in high-humidity environments.

3. Fire Resistance

• Both materials exhibit exceptional fire resistance due to their non-combustible composition. Made primarily from inorganic materials like MgO, perlite, and fiberglass mesh, these boards can withstand high temperature without emitting toxic smoke or flames. They are certified to meet Class A1 fire ratings in many regions, making them an ideal choice for fire-rated walls, ceilings, and doors in both residential and commercial buildings.

4. Application Scenarios

• Both types can be used for interior wall, floor, ceiling, door of residential buildings and commercial buildings. However, as shown above, inferior chloride board may develop salt efflorescence in humid environments. If you’re not sure whether the boards you purchased have been soaking-treated, it’s recommended NOT to use magnesium chloride boards in bathrooms, kitchens, or other humid environments. Instead, you can opt for magnesium sulfate boards or magnesium chloride boards produced by Suparna.
• Click HERE to see if we can use mgo boards for exterior walls.

5. Material Compatibility

• In terms of material compatibility, magnesium chloride demonstrates better compatibility with other substances, enabling the production of higher-performance magnesium oxide boards. For example, it works more effectively with waterproofing agents, which is why most of the so-called “waterproof boards” on the market are based on magnesium chloride. Similarly, when producing laminated boards, magnesium chloride boards are more compatible with surface materials such as PVC film.

If you have any questions, click here to contact us!