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High-Quality Magnesium Oxide Boards (MgO Boards) from China Suppliers and Factory for Fire Resistance and Moisture Protection

MgO board, or magnesium oxide board, is an innovative building material predominantly made of high-quality magnesium oxide, magnesium chloride, and reinforced with glass fiber. This exceptional product, sourced from trusted suppliers in China, features non-woven fabric and other reinforcing materials to enhance its durability. Known for its outstanding properties, including fire resistance, moisture resistance, and a superior strength-to-weight ratio, MgO board is ideal for various applications, such as interior and exterior wall decoration, ceilings, and partition projects in construction. As a leading factory in the industry, we guarantee the highest standards of quality for our MgO boards, making them a preferred choice for builders and architects alike

Forest Calcium Silicate Board for wide building application (8)

Excellent fire resistance

Non-combustible class A material
Superior water proofing ability

Good moisture resisting ability, not easy to generate swelling or shaping.
High Strength

The wall of Calcium Silicate board is very strong and durable, not easy to be damaged.
Wonderful sound and heat insulation performance

Filled with mineral wool, not only heat insulation but also sound insulation
Stable Dimensions

Both moisture movement and the shrinking percentage are controlled in a optimum range.

Product Details

📐 1. Core Parameters

Density	950 – 1150 kg/m³ (59 – 72 lb/ft³) — Optimized for strength-to-weight ratio
Thickness	6mm, 8mm, 9mm, 12mm, 15mm, 18mm, 20mm Custom Available
Size	1220mm × 2440mm (4′ × 8′), 1200mm × 2400mm Custom Available
Color	Natural off-white / light gray

🔥 2. Fire Performance A1 Grade

Fire Reaction	A1 — Highest non-combustible classification
Flame Spread	Zero flame spread (ASTM E84 / UL 723: Class A)
Smoke Developed Index (SDI)	< 5 (ASTM E84 / UL 723)
Heat Release	Total Heat Release (THR) and Peak Heat Release Rate (PHRR) — minimal
Toxicity	Zero

💪 3. Mechanical Strength & Durability

Flexural Strength	≥ 15 MPa (EN 12467)
Modulus of Elasticity	≥ 4500 MPa (EN 12467)
Impact Resistance	High resistance to impact damage
Screw Holding Capacity	Meets or exceeds relevant building standards
Nail Pull Resistance	≥ 75 lbf (340 N) (ASTM C473)
Thermal Shock Resistance	Exceeding 1000°C without spalling or cracking

💧 4. Moisture & Environmental Resistance

Water Resistance	< 10% by weight after 24h immersion (EN 12467)
Moisture Vapor Transmission	Allows walls to "breathe"
Freeze-Thaw Resistance	Excellent performance after multiple cycles (ASTM C666)
Mold & Mildew Resistance	Inherently inorganic core inhibits growth (ASTM G21, ASTM D3273)

🔊 5. Thermal & Acoustic Properties

🌡️ Thermal Conductivity (λ)

~0.15 – 0.20 W/(m·K) — Provides basic insulation

🔉 Acoustic Performance

Contributes to sound reduction in wall/ceiling assemblies (STC ratings vary by system design)

🌿 6. Environmental & Health

VOCs: Zero VOC emissions (tested per ISO 16000, AgBB)

Formaldehyde: Free (< Detection Limit — EN 717-1, JIS A 1460, ASTM E1333)

Asbestos & Heavy Metals: Free (tested per relevant international regulations)

Recyclability: Inherently recyclable mineral content

Sustainable Sourcing: Primary raw materials from abundant natural minerals

🛠️ 7. Surface & Workability

Surface Finish: Smooth, low-dust factory finish ("PureGuard Treated" for improved adhesion)

Machinability: Easily cut, routed, drilled, and shaped with standard woodworking tools (minimizes silica dust vs. cement boards)

Adhesion: Excellent substrate for direct application of tiles, renders, plasters, paints, and veneers

🏅 8. Certifications & Compliance

Fire: EN 13501-1: A1, ASTM E84 Class A, BS 476 Parts 4, 6, 7, 11, UL Certification (System dependent)

Structural: EN 12467, ASTM C1288 / C1325

Environment / Health: LEED contributable, GREENGUARD Gold (or equivalent), EPDs (Environmental Product Declarations)

Quality: ISO 9001

Decorative Magnesium Oxide Board for Interior Walls

❓ Frequently Asked Questions

Q What fire rating does the Magnesium Oxide Board achieve?

The MgO board achieves an A1 fire reaction classification under EN 13501-1 — the highest non-combustible rating available. It also meets ASTM E84 Class A standards with zero flame spread and a Smoke Developed Index (SDI) of less than 5, making it suitable for the most demanding fire-safe construction applications.

Q Is Magnesium Oxide Board safe for indoor use — does it emit VOCs or formaldehyde?

Yes, it is completely safe for indoor environments. The MgO board produces zero VOC emissions (tested per ISO 16000 and AgBB standards) and is entirely formaldehyde-free (below detection limits per EN 717-1, JIS A 1460, and ASTM E1333). It is also free from asbestos and heavy metals.

Q What standard sizes and thicknesses are available?

Standard sheet sizes are 1220mm × 2440mm (4′ × 8′) and 1200mm × 2400mm. Available thicknesses include 6mm, 8mm, 9mm, 12mm, 15mm, 18mm, and 20mm. Custom sizes and thicknesses can also be manufactured to meet specific project requirements.

Q How does MgO Board perform in wet or humid environments?

MgO board offers excellent moisture resistance, absorbing less than 10% of its weight after 24 hours of immersion (EN 12467). Its inorganic core naturally inhibits mold and mildew growth (ASTM G21, ASTM D3273), and it performs reliably through multiple freeze-thaw cycles (ASTM C666), making it ideal for bathrooms, kitchens, and exterior-facing assemblies.

Q Can MgO Board be cut and shaped with standard tools?

Yes. MgO board can be easily cut, routed, drilled, and shaped using standard woodworking tools. Compared to traditional cement boards, it generates significantly less silica dust during processing. Its smooth "PureGuard Treated" surface also provides excellent adhesion for tiles, renders, plasters, paints, and veneers.

Q What certifications does the Magnesium Oxide Board hold?

The board carries a comprehensive range of certifications, including EN 13501-1 (A1 fire), ASTM E84 Class A, BS 476, EN 12467, ASTM C1288/C1325, ISO 9001 (quality management), and GREENGUARD Gold (or equivalent) for indoor air quality. It also contributes to LEED credits and is supported by Environmental Product Declarations (EPDs).

High-Quality Magnesium Oxide Boards (MgO Boards) from China Suppliers and Factory for Fire Resistance and Moisture Protection

Excellent fire resistance

Superior water proofing ability

High Strength

Wonderful sound and heat insulation performance

Stable Dimensions

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