Magnesium Oxide Board  for Construction

Magnesium Oxide Board (MgO Board, also known as magnesia board or glass fiber reinforced magnesium cement board) is an advanced inorganic building panel, widely adopted in residential, commercial and industrial construction for its outstanding fire resistance, moisture tolerance and environmental friendliness, serving as an alternative to gypsum board, plywood and fiber cement board.

1. Composition & Manufacturing Process

• Core raw materials generally include light-burned magnesium oxide (MgO), along with either magnesium chloride (MgCl₂) for traditional formulations, or magnesium sulfate (MgSO₄) for lower-chloride and non-halogen versions. Other typical ingredients are water, alkali-resistant fiberglass mesh as the main reinforcing material, mineral fillers such as perlite and talc, plus various functional additives to help improve water resistance and other performance properties. These boards are usually produced without adding formaldehyde or asbestos.
• Production Flow: Raw material batching & mixing → slurry casting onto glass fiber mesh → rolling for thickness control → room-temperature curing (air-hardening, no high-temperature autoclaving) → cutting, surface finishing, quality inspection, packaging.
• Common Sizes: Standard 4 ft × 8 ft (1220mm × 2440mm); thickness ranges from 6mm to 25mm for different applications (6–12mm for interior walls/ceilings, 15–20mm for exterior sheathing, fire barriers).

 

2. Key Physical & Performance Characteristics

Property	Typical Value/Level	Remarks
Fire Rating	A1 non-combustible (ASTM E136, EN 13501-1)	No toxic smoke when burned; fire resistance can reach 2–4 hours depending on thickness
Water/Moisture Resistance	Low water absorption (<15%); does not swell/delaminate quickly	Long-term immersion should be avoided; sulfate formulations are better for high-humidity areas
Mold/Mildew Resistance	Inorganic matrix, naturally mold-free	Passes ASTM D3273; suitable for basements, bathrooms, coastal regions
Mechanical Strength	Flexural strength >10 MPa; impact-resistant	Can be sawn, nailed, drilled like wood
Environmental Protection	Zero formaldehyde, recyclable, no asbestos	Meets green building material standards
Thermal & Acoustic	Good insulation; 12mm board can achieve ~40 dB sound reduction	Often combined with insulation materials for enhanced effect

 

Magnesium Oxide Board for Construction

3. Main Applications in Construction

• Interior Systems: Partition walls, ceiling substrates, wet-area tile backer boards (bathrooms, kitchens), elevator shaft liners, fire door cores, wall sheathing for modular buildings.
• Exterior Systems: Exterior wall sheathing, facade base panels, EIFS (Exterior Insulation and Finish System) substrates, soffits, balcony cladding.
• Special Scenarios: Industrial plant fire partitions, marine vessel interior panels, temporary construction (camps, disaster relief shelters).

4. International Standards & Quality Certifications

• US: ICC-ES AC386, ASTM C1325, ASTM E136 (non-combustibility)
• EU: EN 13501-1 (fire classification), EN 413 (water resistance)
• China: GB/T 26470, GB 8624 A1 class
• Critical Inspection Items: Chloride ion content (to prevent metal corrosion/efflorescence), water absorption, flexural strength, dimensional stability, fire resistance duration.

5. Advantages & Limitations

Advantages

• Excellent fire performance: Generally rated A1 non‑combustible, and tends to produce very little toxic smoke when exposed to fire.
• Strong moisture & mold resistance: Performs noticeably better than standard gypsum board in humid environments.
• Simple to process and install: Can be cut using regular tools, and works well with most common fasteners.
• Eco-friendly & healthy: Relatively low carbon footprint, recyclable, and supports better indoor air quality.

Limitations & Practical Solutions

• Efflorescence / halogen blooming: May appear in some lower-quality magnesium chloride–based boards. This issue can often be reduced or avoided by using sulfate-based formulas or high-quality anti-efflorescence additives.
• Potential corrosion risk: Free chloride content may corrode steel profiles over time. To minimize this, you can use high-zinc galvanized steel, aluminum or zinc-alloy fasteners, and avoid prolonged contact with water.
• Uneven market quality: Product performance can vary greatly between suppliers. It's recommended to choose reliable manufacturers that can provide third-party test certifications such as AC386 or GB/T 26470.

6. Installation & Best Practices

• Fasteners: Use corrosion-resistant screws (e.g., hot-dip galvanized, stainless steel); pre-drill for thick boards to prevent cracking.
• Joint Treatment: Leave expansion gaps at board edges and between panels; use flexible sealants for exterior applications.
• Weather Protection: Exterior installations must include a weather-resistant barrier (WRB) and proper flashing to avoid prolonged water contact.
• Avoid: Direct, permanent immersion in water; using uncoated mild steel fasteners/studs in high-humidity areas.

 

 

Magnesium Oxide Board for Construction：

7. Market Trends & Development Directions

• Formula Upgrades: Wider adoption of magnesium sulfate systems to eliminate efflorescence and metal corrosion issues.
• Functional Integration: Composite MgO boards with thermal insulation, sound absorption, or even phase-change materials for smart building envelopes.
• Prefabrication & Modular Construction: Lightweight, dimensionally stable MgO panels are increasingly used in off-site construction to improve efficiency.

 

Product details

 

About The Factory：

 

Our Service：

1. Reply your enquiry in 24 working hours.

2. Experienced staffs answer your questions in professional and fluent English.

3. The dimensions can be customized.

4. Special discount and protection of sales are provided.

5. Be the best magnesium oxide board supplier in China.

 

Company Advantage (Why choose us)：

 

Specializing in the durability of building materials, we have established ourselves as a leading provider in the local fireproof flooring sector by offering robust, fire-resistant boards.

 

Our rigorous full-process quality control system ensures consistency at every stage:

   1. Incoming Quality Control (IQC) for raw materials to verify baseline standards

   2. In-Process Quality Control (IPQC) with continuous monitoring of critical production phases

   3. Outgoing Quality Control (OQC) covering final cutting, packaging, and comprehensive checks before dispatch.

 

All our finished products adhere to national and industry benchmarks, undergoing thorough testing against standards such as GB/T 33544 or T/CMMA8-2020. We also accommodate custom testing requirements specified by clients, ensuring that only inspected and certified products are released for delivery. This commitment to quality has solidified our reputation for reliability in fireproof building solutions.

 

Packing and Shipping:

Packaging and Shipping of Magnesium Oxide Board for Construction

 

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.

 

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