Magnesium Oxide Wall Sheathing Panels

Magnesium Oxide Wall Sheathing Panels, or MgO wall sheathing for short, are high-performance, multi-purpose building materials used in all kinds of construction - from homes and apartments to commercial buildings and industrial projects.

Made from widely available magnesium oxide (MgO) minerals, these panels are produced by mixing magnesia cement with inert fillers and curing them under controlled conditions. The result is a product that performs better than traditional sheathing materials like drywall, OSB, plywood, and fire-retardant wood in many key areas.

Thanks to their strong fire resistance, moisture resistance, stable structure, and eco-friendly properties, MgO wall sheathing has become a top choice in modern construction - especially in areas with tough weather conditions or strict building safety requirements.

MgO wall sheathing is a non-combustible structural panel made specifically for exterior and interior wall applications. It acts as a protective, supportive layer in building envelopes.

The main material, magnesium oxide (MgO), is usually extracted from natural magnesite (MgCO₃) through a heating process. When mixed with a magnesium salt solution (such as chloride, sulfate, or phosphate), it forms Sorel cement - a highly fire-resistant base material for the panels.

 

Magnesium Oxide Wall Panels

 

 Key Components

Each component of MgO wall sheathing panels plays a vital role in determining its properties, and high-quality panels strictly control the proportion of raw materials to meet industry standards:

• Magnesium Oxide (MgO): The core material, providing exceptional fire resistance, structural strength, and chemical stability. It forms strong bonds with oxygen atoms, creating durable MgO crystals that underpin the panel's performance.
• Magnesium Chloride/Sulfate: Acts as a curing agent, reacting with MgO to form Sorel cement, which enhances the panel's hardness and water resistance. Chloride-free formulations are also available to avoid potential corrosion issues.
• Inert Fillers: Perlite, vermiculite, or wood fiber are added to reduce density, improve thermal and sound insulation, and enhance workability without compromising strength.
• Reinforcing Materials: Glass fiber mesh or non-woven fabric is embedded in the panel to prevent cracking, improve tensile strength, and enhance impact resistance during installation and use.

Standard Physical Specifications

MgO wall sheathing panels are available in a range of sizes and thicknesses to adapt to different construction needs, with the following common specifications (varies by manufacturer):

• Thickness: 6mm–20mm, with 12mm (½ inch) and 16mm (5/8 inch) being the most widely used for standard wall sheathing; thicker panels (15mm–20mm) are suitable for heavy-duty or fire-rated applications.
• Dimensions: Standard sheet sizes include 1220mm × 2440mm (4ft × 8ft), 1220mm × 2740mm, and 1220mm × 3048mm, compatible with most construction framing systems.
• Density: 1000–1100 kg/m³, ensuring a balance of lightweight handling and structural robustness.
• Fire Rating: A1 non-combustible grade, meeting ASTM E119 (1–2 hour fire-rated wall assemblies) and ASTM E84 (zero flame spread, zero smoke developed index) standards.
• Moisture Movement: 0.1%–0.12%, minimizing warping, swelling, or delamination even in humid environments.
• Flexural Strength: 10–16 MPa, outperforming gypsum and OSB in fastener withdrawal and shear strength.

 

Outstanding Performance Characteristics

MgO wall sheathing panels' popularity stems from their comprehensive performance advantages, which address key pain points of traditional sheathing materials:

Fire Resistance

MgO wall sheathing panels are Class A1 non-combustible. They won't burn, melt or release toxic fumes at high temperatures, withstanding up to 800℃ without damage and igniting only at 1200℃ (2–3 hours of fire protection). Ideal for fire-rated areas, they stay stable in fires (unlike OSB/FRTW).

Moisture and Mold Resistance

MgO panels are naturally moisture-resistant with low water absorption, not warping or swelling even in short-term moisture. Inorganic and antimicrobial, they resist mold and rot, perfect for high-humidity areas where traditional gypsum boards easily deteriorate.

Structural Stability and Durability

High in hardness and density, MgO panels offer great structural support for exterior cladding. They attach securely to frames, pass 36-month freeze-thaw tests (-40℃ to 80℃), are termite-proof, and last 20–30 years with little maintenance.

Eco-Friendliness and Health Safety

MgO panels are eco-friendly: made of abundant magnesium oxide, low-energy to produce, CO₂-absorbing during curing, 100% recyclable and non-toxic (no formaldehyde). They're safe for sensitive people and meet green building standards (e.g., LEED).

Versatility and Workability

Easy to cut, drill and install with basic tools, MgO panels can be mounted vertically/horizontally on various frames (with small gaps for thermal expansion). They accept many finishes, suitable for both interior and exterior use.

 

Application Scenarios

Thanks to their comprehensive performance, MgO wall sheathing panels are widely used in various construction scenarios, replacing traditional sheathing materials in many projects:

• Residential Construction: Exterior and interior wall sheathing, basement walls, attic ceilings, and tile backer boards in kitchens, bathrooms, and other wet areas. They are also suitable for modular homes and renovation projects.
• Commercial Construction: Wall sheathing for office buildings, shopping malls, hotels, hospitals, and schools. Particularly ideal for fire-rated areas (stairwells, elevator shafts) and high-humidity spaces (swimming pools, bathrooms).
• Industrial Construction: Wall sheathing for factories, warehouses, and workshops, where fire resistance, moisture resistance, and durability are critical.
• Special Environments: Coastal regions (resistant to salt spray and humidity), cold regions (freeze-thaw resistant), and fire-prone areas (non-combustible performance). They are also used in landmark projects, such as Taipei 101, for fireproofing and wall sheathing.

 

 

Magnesium Oxide Wall Panels Factory

 

Comparative Advantages Over Traditional Materials

Compared to traditional wall sheathing materials, MgO panels offer clear advantages, as summarized below:

vs. Gypsum Board: Superior moisture resistance (no swelling/warping in humid environments), fire resistance (A1 grade vs. gypsum's lower rating), and durability (no paper facing to deteriorate).

vs. OSB/Plywood: Non-combustible (OSB/plywood are flammable), mold-resistant (OSB/plywood are prone to rot), and termite-proof (OSB/plywood attract wood-boring insects).

vs. Fiber Cement Board: Lighter weight (easier to install), better thermal insulation, and no crystalline silica (safer for installers).

 

FAQ:

Q: What is your delivery time?

A: 1 month after receiving the deposit.

Q: Can you customize products?

A: Yes, we can cut any size as needed.

Q: What is your MOQ? Can we order a mix of different sizes?

Answer: Yes. The MOQ is 100 pieces and mixed loading is also acceptable.

 

Packing and Shipping for Magnesium Oxide Wall Sheathing Panels:

 

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