Magnesium Oxide Board Fire Resistant Assembles

Magnesium Oxide (MgO) board fire-resistant assemblies are basically a specially designed, non-combustible building system. To put it simply, they combine MgO boards with framing, insulation materials, joint treatments, and finishing components, aiming to provide verified fire resistance for walls, ceilings, shafts, and fire barriers-specifically including three aspects: integrity, insulation, and load-bearing capacity. These assemblies have clear system-level fire test ratings, such as being able to withstand fire for 30 minutes, 60 minutes, 90 minutes, or even more than 120 minutes. They also comply with relevant international standards, like EN 13501-1 (Class A1), ASTM E136, and ICC-ESR. That's why they're particularly crucial in projects with high fire risks and strict building code requirements.

 

MgO Board: It's an inorganic composite panel, mainly composed of magnesium oxide, magnesium chloride/magnesium sulfate, glass fiber mesh, and mineral fillers. It's inherently non-combustible, with a melting point of about 2800 degrees Celsius, so it has extremely strong high-temperature resistance.

 

Fire-Resistant Assembly: It's not just a single panel, but a complete set of systems-including all components like MgO boards, framing, joints, and sealants. It needs to be tested as a whole to meet the fire resistance requirements specified in the ASTM E119/EN 1363-1 standards, which are the three aspects mentioned earlier: integrity, insulation, and load-bearing capacity.

 

Fire Resistance Rating (FRR): Simply put, it's how long the assembly can withstand fire while maintaining integrity, insulation, and load-bearing capacity. For example, a 60-minute rating means it can withstand fire for 60 minutes and meet all three requirements at the same time.

 

Why are MgO fire-resistant assemblies so excellent?

 

First, the ceramization property: When the temperature reaches 800 to 1200 degrees Celsius, the MgO board will form a dense, non-flaking ceramic layer, which can effectively block the transmission of oxygen and heat, preventing the fire and high temperature from spreading further.

Second, the endothermic cooling effect: The magnesium hydroxide in the MgO board releases water vapor when heated, which can reduce the temperature on the back of the board, playing a role in cooling and delaying the spread of the fire.

 

Third, the advantage of low toxicity and low smoke: It meets the Class A1 non-combustible standard, producing very little smoke when burned (smoke density index ≤ 450), and the fumes generated are non-toxic (toxicity index ≤ 0.5). This is particularly important for personnel evacuation in the event of a fire.

 

Finally, strong structural stability: Even in high-temperature environments up to 1200 degrees Celsius, it can maintain its own strength, not melt or drip, and can keep structural stability all the time.

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Common Assembly Types & Typical Configurations

Assemblies are categorized by application and FRR. Below are engineered, test-validated configurations (adjust per project specs and local codes).

 

1. Load-Bearing Fire-Resistant Wall (Steel Stud)

Target FRR: 60–120 min (E60 I60 R60 to E120 I120 R120)

 

Framing: 60×200×1.5 mm galvanized steel studs (400/600 mm centers); 0.8 mm track

MgO Boards: 12 mm (1hr) / 15 mm (2hr) A1 MgO (fiberglass-reinforced); 2 layers per side (staggered joints)

Cavity: Mineral wool insulation (100–150 mm, density ≥ 100 kg/m³; non-combustible)

Joints: Intumescent sealant (≥ 12 mm width) at panel edges; self-adhesive glass fiber tape + MgO joint compound

Fasteners: Galvanized screws (35–45 mm length); 150 mm spacing at edges, 300 mm in field

Finish: Fire-rated primer + intumescent paint (optional for extra FRR)

 

2. Non-Load-Bearing Partition (Wood Stud, Fire-Rated)

Target FRR: 30–60 min (E30 I30 to E60 I60)

 

Framing: 50×100 mm treated wood studs (400 mm centers); fire-retardant coating

MgO Boards: 9–12 mm A1 MgO (1 layer per side for 30 min; 2 layers for 60 min)

Cavity: Fire-retardant mineral wool (80 mm)

Joints: Fire-rated acrylic sealant + glass fiber tape

Fasteners: Zinc-plated screws (30–35 mm); 120 mm edge spacing

 

3. Fire-Rated Ceiling (Suspended)

Target FRR: 30–60 min (E30 I30 to E60 I60)

 

Grid: Galvanized steel main tees (600 mm centers) + cross tees (600×600 mm)

MgO Boards: 12 mm A1 MgO lay-in panels (tongue-and-groove edges)

Above Ceiling: Mineral wool insulation (100 mm) between joists; fire dampers at duct penetrations

Penetrations: Intumescent collars for pipes/cables; fire-rated sealant for gaps

 

4. Shaft Wall (Elevator/Stairwell) – High FRR

Target FRR: 120–240 min (E120 I120 to E240 I240)

 

Framing: 75×200×2.0 mm steel studs (400 mm centers); double tracks top/bottom

MgO Boards: 15–18 mm A1 MgO (3 layers per side; staggered joints)

Cavity: Dense mineral wool (150 mm, ≥ 120 kg/m³)

Joints: Intumescent sealant + metal edge trim; welded stud connections

Penetrations: Fire-rated shaft collars; smoke seals at elevator doors

 

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Critical Design & Installation Best Practices (Avoid Common Failures)

System-Level Thinking: FRR depends on the entire assembly, not just the board. Reference ICC-ESR or EN 1363-1 test reports for exact configurations.

Joints & Penetrations: 80% of fire failures occur here. Use:

Intumescent sealant for panel edges, stud gaps, and penetrations (pipes, cables).

Staggered joints (≥ 200 mm offset) for multi-layer assemblies.

Fire-rated collars/ sleeves for all service penetrations.

Fastening: Follow screw spacing strictly (150 mm edges / 300 mm field) to prevent delamination under heat.

Insulation: Use only non-combustible insulation (mineral wool, ceramic fiber) in cavities. Avoid foam plastics (combustible).

Exterior Use: Protect MgO boards with a water-resistive barrier (WRB) and UV-resistant finish (per IBC Section 1402.2).

Quality Control: Require third-party test reports (not just board-level certificates) and on-site inspections for joint integrity.

 

About Fire Resistant Flooring Board

 

Typical Applications & Project Examples

• MgO fire-resistant assemblies are ideal for high-occupancy, high-risk, and code-mandated spaces:
• Commercial/Institutional: Hospitals, schools, hotels, shopping malls, and office towers (corridors, fire partitions).
• Industrial: Warehouses, power plants, and manufacturing facilities (fire barriers between production zones).
• Infrastructure: Elevator shafts, stairwells, and tunnel linings (critical for evacuation).
• Residential: High-rise apartments and townhouses (unit separations, garage walls).
• Case Example: A 40-story residential tower in Dubai specified 120-minute fire-rated MgO shaft walls (15 mm MgO, 3 layers per side) to comply with local fire codes. The assemblies met EN 1363-1 (E120 I120) and reduced smoke spread by 67% in fire simulations.

 

Fire Resistant Flooring Board Application Scenarios

 

 

Fire Resistant Flooring Board Features And Advantages

 

Product Detail：

Comparison to Traditional Fire-Rated Assemblies

Aspect	MgO Board Assemblies	Gypsum Board Assemblies	Cement Board Assemblies
Combustibility	A1 (non-combustible)	A2 (limited combustible)	A2 (limited combustible)
FRR Range	30–240+ min	30–120 min	30–60 min
Moisture Resistance	Excellent (no warping/mold)	Poor (swells in wet areas)	Good (but heavy)
Weight	Light (12–18 kg/m²)	Light (10–15 kg/m²)	Heavy (25–35 kg/m²)
Durability	Termite/rot-resistant	Prone to damage	Brittle (cracks easily)
Toxicity/Smoke	Low (FED ≤ 0.5, SDI ≤ 450)	Moderate (higher smoke)	Moderate (higher smoke)

 

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To ensure compliance, include these clauses in project specs:

• Assembly Performance: FRR (e.g., E60 I60 R60) per ASTM E119/EN 1363-1; Class A1 per EN 13501-1/ASTM E136.
• Materials: MgO board thickness (12/15 mm), framing type (steel/wood), insulation density (≥ 100 kg/m³), and sealant type (intumescent).
• Installation: Joint spacing, screw patterns, and penetration details (per ICC-ESR or test report).
• Submittals: Third-party test reports (assembly-level), material certifications (A1), and installation drawings.

 

About The Factory：

Fire Resistant Flooring Board Factory

Our Service：

Our reputation is built on our innovative formula design, rigorous quality control, technical expertise, and meticulous attention to detail-all ensuring consistent product excellence.

We take pride in our proactive service model, dedicated to ensuring our products align with your project requirements. Every batch undergoes laboratory testing, and each panel is inspected prior to packaging, guaranteeing uncompressed quality at every stage.

 

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 with 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.

 

FAQ:

 

1. Q: Can you customize products according to our requirements?
     A: Yes, we gladly accept OEM/ODM orders to meet your specific needs.
2. Q: What are your payment terms?
     A: Payment is made via T/T: 50% deposit upfront, with the balance due before shipment.

 

Packing And Shipping:

Packaging And Shipping Of Magnesium Oxide Board Fire Resistant Assembles

 

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