There’s a lot of information online about magnesium oxide boards, but much of it is scattered, inconsistent, and hard to verify. For buyers and new users trying to make informed decisions, this can be confusing—if not overwhelming.
As a manufacturer with over 20 years of experience in producing high-quality MgO boards, we believe it’s our responsibility to create a reliable knowledge base. Our goal is to provide clear, accurate, and practical insights into magnesium oxide boards, helping you understand the material and make the right choices for your project.
If you have any questions or suggestions regarding the content, feel free to reach out. We’re always here to help—and continuously working to improve this resource.
1. What is MgO Board?
Magnesium oxide board, also known as MgO board, is a fire-resistant building material made from magnesium oxide, fiberglass mesh, wood sawdust, and other components. It is widely used in passive fire protection systems for both residential and commercial buildings.
Known for its excellent fire resistance, moisture resistance, environmental friendliness, and non-toxicity, MgO board is an upgraded alternative to traditional materials such as cement board, gypsum board, and calcium silicate board.
2. Different Types
Magnesium oxide boards are mainly divided into two types based on their chemical composition: Magnesium Chloride Boards and Magnesium Sulfate Boards.
3. Raw Materials
The main raw materials of magnesium oxide board include:
- Magnesium oxide
- Magnesium chloride or magnesium sulfate
- Perlite
- Wood sawdust
- Fiberglass mesh
- Non-woven fabric
4. Applications
Magnesium oxide boards are widely used in passive fire protection systems for both residential and commercial buildings.
✅ Sub-flooring
✅ Fire door
✅ Decorative panel
✅ Acoustic panel
✅ Fireplace
✅ Duct
✅ Kitchen
✅ Laundry room
✅ Office buildings
✅ Hotels
✅ Theaters
✅ Schools
✅ Data centers
✅ Libraries
✅ Highway Tunnels
✅ Interior wall
✅ Sub-flooring
✅ Fire door
✅ Ceiling
✅ Decorative panel
✅ Acoustic panel
✅ Furniture
✅ Fireplace
✅ Duct
✅ Bathroom
✅ Kitchen
✅ Laundry room
✅ Office buildings
✅ Shopping malls
✅ Hotels
✅ Theaters
✅ Schools
✅ Gyms
✅ Data centers
✅ Libraries
✅ Highway Tunnels
5. Specification
The most common sizes of magnesium oxide boards are 1220*2440mm (4*8ft) or 1200*2400mm, with the maximum size reaching up to 1200*3000mm (4*10ft).
Since the standard mold sizes available on the market are typically fixed at 1300*2500mm and 1300*3100mm, all other smaller sizes are cut from the 1200*2400mm and 1200*3000mm boards.
Magnesium oxide (MgO) boards are available in a wide range of thicknesses, typically from 3mm to 40mm, depending on the application.
✅ Wall panels: commonly 8mm, 10mm, or 12mm
✅ Flooring panels: 18mm or 20mm
✅ Ceiling boards: 5mm or 6mm
✅ Tunnel boards: up to 40mm
✅ Door core panels: typically 38mm or 48mm
Magnesium oxide (MgO) boards have a density range of 650–1400 kg/m³, depending on their intended use.
✅ Wall panels: typically 900–1000 kg/m³
✅ Flooring panels: 1200–1400 kg/m³
✅ Door core panels: 240–350 kg/m³
The standard magnesium oxide (MgO) board features a smooth and flat front surface, while the back side has a slightly rough texture with a fiberglass mesh pattern.
✅ Sanded: The back side is further processed to become smoother and more even. Click HERE to see the differences between regular mgo board and sanded mgo board.
✅ Special treatment: The board surface can also be laminated with other materials such as PVC film to create decorative finishes with various patterns and designs.
6. Advantages
Magnesium oxide board is a next-generation building material known for its durability, fire resistance, and eco-friendliness. It provides an ideal solution for both residential and commercial applications. Key features include:
Magnesium oxide board is a next-generation building material known for its durability, fire resistance, and eco-friendliness. It provides an ideal solution for both residential and commercial applications. Key features include:
7. Limitations
❌ When used for exterior walls, mgo boards cannot be directly exposed to sunlight, rain, and wind, as this will significantly shorten the lifespan.
❌ Chloride-based MgO 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.
8. Production Process
The production process of mgo board typically includes the following steps: raw material mixing, board forming, curing, demolding, drying, and cutting.
7. Soaking (Chloride Board)
8. Drying
9. Cutting
1. Material Preparation
2. Material Mixing
3. Board Forming
4. Curing Phase I
5. Demolding
6. Curing Phase II
9. Installation Method
The installation method for magnesium oxide boards is similar to that of other fire-resistant building materials. Thanks to their lightweight structure and ease of cutting and screw-fixing, they offer great flexibility during construction.
There are no strict limitations on how to install them—construction teams can apply standard practices or follow their own experience to determine the best approach on site.
Note: An important precaution is to avoid prolonged exposure to rainwater, which may affect the performance of the board.
Below are typical installation methods for interior partition walls and sub-flooring systems, provided for your reference.
10. Packaging
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 (customizable with logos). Upon customer request, edge and side protection can also be added.
Plastic bag + strap
Plastic bag with logo
Stretch film + strap
Corner protection
Edge protection
11. Container Loading
Forklift for loading
Pallets placed vertically
Dunnage airbag
