What is mgo board?

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MgO board, also known as magnesium oxide board, is typically manufactured as a white, rigid rectangular panel designed to block or slow the spread of flames in residential and commercial buildings.

As an essential component of passive fire protection systems, it is widely used for walls, ceilings, fire doors, subfloors, and other fire-rated building applications, where it acts as a reliable barrier against fire, helping protect both structures and occupants.

It is an ideal alternative to traditional gypsum board, cement board, and plywood in many applications.

Magnesium oxide board are mainly divided into two types based on their chemical composition: magnesium sulfate board (MgSO4 board) and magnesium chloride board (MgCl2 board).

• Main composition: MgSO4 + MgO
• Corrosion-free
• Best for High-humidity areas & metal-framed constructions

• Main composition: MgCl2 + MgO
• Require soaking process to reduce corrosion risk
• Cost-effective, suitable for standard interior applications

→ See full differences between MgSO4 Board and MgCl2 Board

→ See all the mgo board applications

Magnesium oxide board are available in a wide range of sizes, thicknesses, densities, surface finishes, edge profiles, and colors to meet different construction requirements. Whether for walls, ceilings, flooring, fire doors, or prefabricated buildings, custom specifications are also available upon request.

The most common MgO board sizes are 1220×2440 mm (4×8 ft) and 1200×2400 mm, while boards up to 1200×3000 mm (4×10 ft) are also available for large-scale projects.

Common options include:

• 1220 × 2440 mm (4 × 8 ft)
• 1200 × 3000 mm (4 × 10 ft)
• Custom sizes available

Magnesium oxide boards are manufactured in different thicknesses to suit various applications.

Different applications require different board densities to balance strength, weight, and performance.

Multiple surface treatments are available to satisfy different installation and decorative requirements.

Different edge profiles are available for easier installation and improved joint performance.

White is the standard color of MgO board. Other colors can be produced by adding pigments during manufacturing.

Magnesium oxide board combines fire safety, durability, moisture resistance, and environmental performance in a single high-performance building panel. Whether for residential, commercial, or industrial projects, it delivers reliable protection, longer service life, and easier installation.

While drywall and cement board are both widely used in modern construction, they serve different purposes. The following overview highlights how magnesium oxide board compares with each material. For a more detailed analysis, explore our dedicated comparison guides below.

Both magnesium oxide board and cement board provide excellent fire and moisture resistance. However, magnesium oxide board is generally lighter, easier to cut and install, and less prone to edge chipping, making it a more practical choice for many residential and commercial applications.

→ Read the full comparison: MgO Board vs Cement Board

Drywall is ideal for budget-conscious interior applications, while cement board performs well in demanding wet environments. If your project requires a balanced combination of fire safety, moisture resistance, durability, and easy installation, magnesium oxide board provides the most versatile solution.

The main raw materials of magnesium oxide board include:

• Magnesium oxide
• Magnesium chloride or magnesium sulfate
• Perlite
• Wood sawdust
• Fiberglass mesh
• Non-woven fabric
• Water

→ Learn more about the components of mgo board

The production process of magnesium oxide board typically includes the following steps:

• Material Preparation & Mixing
• Board Forming
• Curing Phase
• Demolding
• Drying
• Cutting & Packaging

→ Check the whole production process here

Installing magnesium oxide board is simple and similar to installing gypsum board or fiber cement board. The boards can be cut with standard tools and fastened using corrosion-resistant screws or nails.

Before installation, ensure the framing or substrate is clean, dry, and level. Secure the boards according to the recommended fastener spacing, treat the joints with compatible materials, and finish the surface as required.

For detailed installation instructions, please refer to:

→ Complete MgO Board Installation Guide

The packaging of magnesium oxide boards typically involves stacking the boards on wooden pallets, securing them with packing straps, and wrapping them with stretch film or plastic bags that can be customized with logos. Upon request, additional edge and side protection can also be provided.

Everything you need to know about magnesium oxide board. Browse our frequently asked questions covering product performance, applications, installation, certifications, pricing, and more.