Magnesium Oxide Exterior Cladding Board
Magnesium oxide board demonstrates good mildew-proof characteristics due to its unique advantages. Its alkaline nature resulting from the main raw materials is not conducive to the growth of mold. Moreover, its compact internal structure can effectively prevent water vapor from penetrating, reducing the formation of a damp environment. In addition, it has fairly good stability and water resistance, enabling it to maintain its own state for a long time and avoid mold growth caused by moisture and other factors. Overall, it stands out among numerous boards in terms of mildew prevention. Magnesium Oxide Exterior Cladding Board is a high-performance, sustainable solution for exterior walls, offering unbeatable fire safety, moisture resistance, and durability. By choosing chloride-free formulations and following proper installation practices, it delivers a long-lasting, low-maintenance exterior that meets the most stringent building codes and environmental standards.
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Product Introduction
Magnesium Oxide Exterior Cladding Board
Magnesium Oxide (MgO) Exterior Cladding Board is a high-performance, mineral-based cementitious panel engineered for exterior wall sheathing and finished siding in residential, commercial, and industrial construction. It is renowned for its A1 non-combustible fire rating, superior moisture/rot resistance, dimensional stability, and eco-friendly composition, making it a premium alternative to gypsum, plywood, and fiber cement boards.
MgO cladding is formulated from a magnesium-based cement matrix reinforced with inert fillers and glass fiber mesh, cured under controlled conditions to form a dense, durable panel.
Magnesium Oxide (MgO): Primary binder, High fire resistance, low shrinkage
Magnesium Sulfate (MgSO₄): Activator (chloride-free) Prevents, steel corrosion, enhances water resistance
Glass Fiber Mesh: Reinforcement Improves, flexural strength, resists cracking
Inert Fillers (Perlite, Silica): Density & insulation, Lightweight,thermal/acoustic performance
Critical Note: Chloride-free (MgSO₄-based) formulations are mandatory for exterior use to avoid corrosion of fasteners and framing, ensuring long-term durability.
Performance
Engineered to withstand harsh outdoor conditions, MgO cladding outperforms traditional materials in critical areas:
Fire Resistance: A1 Non-Combustible (ASTM E136); up to 4-hour fire rating Blocks flame spread, maintains structural integrity at 800°C+
Moisture & Water Resistance: No swelling, warping, or delamination (short/medium exposure) Ideal for high-humidity climates, rain-prone regions, and coastal areas
Dimensional Stability: Low moisture movement (0.1%–0.15%) Resists cracking from temperature fluctuations (-40°C to 80°C)
Durability: Impact-resistant, termite/fungus/mold-proof Eliminates rot, pest damage, and mold growth on exterior walls
Eco-Friendliness: Formaldehyde-free, low VOC, 100% recyclable Complies with green building standards (LEED, BREEAM)
Thermal & Acoustic: Thermal conductivity ~0.25–0.35 W/(m·K) Reduces energy costs; dampens external noise
Product Varieties & Dimensions for Exterior Use
MgO cladding is available in two primary configurations to suit different exterior applications:
1. Exterior Wall Sheathing (Substrate)
Purpose: Structural backing for EIFS, stucco, brick veneer, or finished siding.
Dimensions: 1220×2440mm, 1220×2740mm, 1220×3048mm; thickness 6–15mm.
Surface: Standard (smooth) or sanded for better adhesive bonding.
2. Finished Exterior Siding (Visible Cladding)
Profiles: Tongue & Groove (T&G), Shiplap, or custom textures (wood grain, stucco).
Installation: Horizontal interlocking with hidden fasteners for a clean, weather-tight finish.
Sizes: 4′×8′, 4′×10′ (1220×2440mm, 1220×3048mm); thickness 8–18mm.
Applications & Project Types
MgO exterior cladding is versatile and suitable for:
Residential: Single-family homes, townhouses, apartments (siding/sheathing).
Commercial: Office buildings, retail centers, hotels, hospitals (fire-rated exteriors).
Industrial: Warehouses, factories, power plants, battery energy storage systems (BESS) (fire/thermal protection).
Special Projects: Modular buildings, prefabricated homes, coastal structures, and high-rise fire partitions.
Product details
About The Factory：
Company Advantage (Why choose us)：
We are a company dedicated to magnesia cement products. Our main products are Magnesium Oxide Boards (MGO Board) for construction and laminated MgO boards for furniture and renovation. Our mission is to provide the world's construction markets with environmentally friendly, high-performance and sustainable green materials.
We work with China Magnesium Materials Association (CMMA) and Magnesium Oxide Association (MOCA) in North America to raise awareness and promote the use of magnesium oxide cement products. We focus on the quality control and consistency of the MGO products. We have been actively involved in developing American Society for Testing and Materials (ASTM) standards related with MGO products.
Packing and Shipping:
Packaging and Shipping for Magnesium Oxide Exterior Cladding Board
FAQ:
Q: Is the magnesium oxide (MgO) board heavy?
A: It depends on its specific application. The density of the MgO board can range from 0.8 to 1.25 g/cm³. For the same level of strength, it is lighter and thinner than the Portland cement board.
Q: Where can MgO boards be used?
A: MgO boards can be applied in almost all situations within a home. Exteriorly, they can be used as wall sheathing, trim, fascia, and siding. Indoors, they can serve as tile backer, wall panel, ceiling board, firewall, and drop ceiling tile. They can also be incorporated into drywall.
Q: What kinds of finishes are suitable for MgO boards?
Any conventional finishes are applicable to this type of board, including concrete and synthetic stucco, paint, plaster, stone, tile, brick, fabric, and wallpaper. The panels need to be primed with a concrete or masonry primer first, and then painted with paint and topcoat.
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