Magnesium Oxide Board For Tunnel/Underground Construction 18mm Fireproof Durable
The 18mm tunnel-specific MGO board is formulated with high-purity magnesium oxide (≥85% content), food-grade magnesium sulfate (instead of corrosive magnesium chloride), reinforced with multi-layer alkali-resistant glass fiber mesh, and modified with mineral admixtures to enhance compactness and impermeability.
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Product Introduction
What Is Magnesium Oxide Board for Tunnel/Underground Construction 18mm Fireproof Durable?
Tailored for the harsh and high-demand environment of tunnel and underground projects, the 18mm Fireproof Durable Magnesium Oxide (MGO) Board is a specialized mineral-based building material engineered to address core challenges of underground construction-fire safety, moisture resistance, structural durability, and corrosion protection. With its optimized 18mm thickness, it balances structural strength, fire resistance, and installation feasibility, making it an ideal solution for tunnel linings, fire partitions, and protective cladding in subway systems, road tunnels, underground stations, and mining tunnels worldwide.
Advantages of Magnesium Oxide Board for Tunnel/Underground Construction 18mm Fireproof Durable
Superior Fire Protection (A1-Class, Long Fire Resistance)
- Fire rating: A1-class (non-combustible) per EN 13501-1 and ASTM E119, with a fire resistance limit of ≥2 hours for 18mm thickness-meets the fire safety requirements of tunnel codes (e.g., EN 45545-2 for railway tunnels, NFPA 502 for road tunnels).
- No toxic fumes: Inorganic composition produces zero smoke or toxic gases (e.g., formaldehyde, cyanide) during combustion, ensuring safe evacuation routes for passengers and reducing fire-related casualties.
- Thermal stability: Maintains structural integrity at temperatures up to 1200°C, preventing collapse of tunnel linings or partitions during extreme fires.
Extreme Durability & Moisture Resistance
- Moisture-proof & anti-mold: Water absorption ≤12% (24-hour immersion) and moisture expansion rate ≤0.2%, resisting groundwater, condensation, and high-humidity environments (common in underground spaces). No warping, delamination, or mold growth even after long-term exposure to moisture.
- Corrosion resistance: Magnesium sulfate-based formula is neutral (pH 7-8), avoiding "salt efflorescence" and corrosion of steel reinforcement, tunnel hardware, or metal fasteners-critical for underground structures where corrosion can compromise safety.
- Impact & abrasion resistance: Flexural strength ≥9 MPa (dry) / ≥7 MPa (wet) and compressive strength ≥18 MPa, withstanding collisions from vehicles, construction equipment, or falling debris. Surface hardness ≥65 Shore D, resisting abrasion from pedestrian traffic or cargo movement.
- Long service life: ≥60 years under normal underground conditions, outperforming traditional materials like cement fiberboard (30-40 years) or fireproof gypsum board (15-20 years) that degrade quickly in moisture.
Structural Compatibility & Safety
- Lightweight & easy installation: Density 1.3-1.4 g/cm³, weighing ~23 kg/m² (18mm thickness)-30% lighter than cement board and 20% lighter than traditional tunnel fireproof lining materials. Reduces structural load on tunnel frames and simplifies installation in confined underground spaces.
- Seamless integration: Compatible with tunnel lining systems (e.g., shotcrete, segmental linings), fireproof coatings, and waterproof membranes. Can be cut, drilled, and shaped with standard tools, adapting to irregular tunnel contours.
- Non-toxic & eco-friendly: Formaldehyde-free, asbestos-free, and VOC-free (meets GREENGUARD Gold standards), ensuring healthy air quality in enclosed underground spaces. Fully recyclable at the end of service life, aligning with green infrastructure initiatives.
Resistance to Harsh Underground Conditions
Chemical resistance: Resists erosion from tunnel exhaust gases (CO, NOx), deicing salts (in road tunnels), and groundwater with high salinity (coastal areas). Unaffected by alkaline or acidic environments (pH 4-10).
Anti-seismic & vibration-resistant: Low modulus of elasticity (≤25 GPa) and good flexibility, absorbing structural vibration from subway trains or road traffic without cracking-critical for tunnel safety in seismic zones.
Rodent & pest proof: Inorganic material does not attract termites, rats, or other pests, eliminating the risk of structural damage from pest infestations in underground spaces.
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Rich Experience
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Magnesium Oxide Board for Tunnel/Underground Construction 18mm Fireproof Durable
1. Product Overview & Core Design Purpose
The 18mm tunnel-specific MGO board is formulated with high-purity magnesium oxide (≥85% content), food-grade magnesium sulfate (instead of corrosive magnesium chloride), reinforced with multi-layer alkali-resistant glass fiber mesh, and modified with mineral admixtures to enhance compactness and impermeability. Unlike standard MGO boards, it undergoes a 28-day precision curing process and high-pressure compaction (≥5000 psi) to meet the strict requirements of underground engineering:
- Provide passive fire protection to delay fire spread and maintain structural integrity during tunnel fires.
- Resist long-term high humidity, groundwater infiltration, and chemical corrosion (e.g., tunnel exhaust, saltwater in coastal areas).
- Withstand mechanical impact (e.g., vehicle collisions, construction debris) and structural vibration (e.g., subway operation).
- Serve as a durable lining or partition material that requires minimal maintenance over decades.
2. Key Technical Specifications (18mm Thickness)
| Parameter | Test Standard | Typical Value |
|---|---|---|
| Fire Rating | EN 13501-1 / ASTM E119 | A1-Class (Non-combustible), ≥2-hour fire resistance |
| Density | EN 12467-3 | 1.3-1.4 g/cm³ |
| Compressive Strength | EN 12467-5 | ≥18 MPa |
| Flexural Strength (Dry) | EN 12467-5 | ≥9 MPa |
| Flexural Strength (Wet) | EN 12467-5 | ≥7 MPa |
| Water Absorption (24h) | EN 12467-4 | ≤12% |
| Moisture Expansion Rate | ASTM D1037 | ≤0.2% |
| Surface Hardness | Shore D | ≥65 |
| Smoke Toxicity | EN ISO 5659-2 | AQ1 (Low toxicity) |
| Corrosion Resistance | ASTM G102 | No corrosion on steel fasteners (magnesium sulfate formula) |
| Service Life | ISO 15686 | ≥60 years |
3. Primary Application Scenarios in Tunnel/Underground Construction
The 18mm fireproof durable MGO board is designed for critical components of tunnel and underground projects, including:
(1) Tunnel Lining Protection
Installed as a secondary lining over shotcrete or segmental linings to provide fire protection, moisture resistance, and abrasion resistance.
Ideal for: Road tunnels, railway tunnels, subway tunnels, and pedestrian underpasses.
Benefits: Prevents fire damage to primary linings, reduces moisture infiltration, and simplifies maintenance (easy to clean or replace damaged panels).
(2) Fireproof Partitions & Escape Routes
Used to construct fire-rated partitions (≥2-hour) in underground stations, tunnel service areas, and emergency escape corridors.
Applications: Separating tunnel traffic lanes, dividing equipment rooms (electrical, ventilation) from public areas, and lining escape tunnels.
Compliance: Meets EN 45545-2 (fire safety for railway tunnels) and NFPA 130 (subway and rail transit safety) requirements.
(3) Cable & Pipeline Protection
Installed as cladding for cable trenches, pipeline ducts, and utility shafts in underground projects to prevent fire spread and physical damage.
Benefits: Protects electrical cables and pipelines from fire, moisture, and impact, reducing the risk of service disruptions.
(4) Underground Station Infrastructure
Used for platform screen doors, wall linings, ceiling panels, and service room enclosures in subway/metro stations.
Advantages: Fireproof, durable, easy to clean (resistant to graffiti and stains), and maintains aesthetic appeal in high-traffic areas.
(5) Mining Tunnels & Underground Warehouses
Applied as lining material for mining tunnels (coal, metal mines) and underground warehouses to provide fire protection, moisture resistance, and corrosion resistance.
Benefits: Withstands harsh mining environments (dust, moisture, chemical exposure) and reduces the risk of fire-related accidents.
4. Installation & Construction Guidelines (Underground-Specific)
(1) Preparation & Handling
Store panels in a dry, covered area within the tunnel/underground site to avoid moisture exposure before installation.
Acclimate panels to the underground environment (12-24 hours) to match ambient temperature and humidity (typically 10-30°C, 60-80% RH).
Ensure the base surface (shotcrete/segmental lining) is clean, flat, and free of debris; repair cracks or uneven areas with mortar before installation.
(2) Fastening & Fixing
Use corrosion-resistant fasteners: Stainless steel (316L) or hot-dipped galvanized screws (≥5mm diameter, 50mm length) to penetrate the base structure by ≥20mm.
Screw spacing: 150mm along panel edges, 300mm in the field (center of panels); avoid over-tightening to prevent panel cracking.
For curved tunnel surfaces: Use flexible fasteners or pre-bend panels slightly (within 5° curvature) to fit the tunnel contour-do not force bending to avoid structural damage.
(3) Joint & Seam Treatment (Critical for Moisture/Fire Protection)
Apply a fire-resistant and waterproof sealant (e.g., intumescent sealant complying with EN 1366-4) to all panel joints and edges before installation.
Install a continuous firestop strip (≥10mm thickness) at vertical and horizontal joints to maintain fire resistance integrity.
For areas prone to groundwater infiltration: Add a waterproof membrane (e.g., PVC or EPDM) between the MGO board and the base lining to enhance impermeability.
(4) Cutting & Fabrication
Cut panels with a circular saw equipped with a tungsten carbide-tipped blade (for clean edges) or a diamond blade (for precision cuts in confined spaces).
Drill holes for cables/pipelines using a masonry drill bit; use edge trimmers to smooth cut edges and prevent fiber fraying.
Avoid cutting panels in areas with high dust concentration-use wet cutting if necessary to reduce dust pollution.
Magnesium Oxide Board for Tunnel/Underground Construction 18mm Fireproof Durable
Competitive Advantages vs. Traditional Tunnel Lining Materials
| Feature | 18mm Tunnel-Specific MGO Board | Cement Fiberboard | Fireproof Gypsum Board | Shotcrete + Fireproof Coating |
|---|---|---|---|---|
| Fire Resistance | A1-Class, ≥2-hour fire resistance (no toxic fumes) | A2-Class, 1-hour fire resistance (brittle when burned) | B1-Class, ≤1-hour fire resistance (releases toxic fumes) | A1-Class, but fireproof coating degrades over time (10-15 years) |
| Moisture Resistance | Excellent (≤12% water absorption, no mold) | Good (but heavy, absorbs water over time) | Poor (swells/delaminates in moisture) | Poor (coating peels off in high humidity) |
| Weight | Lightweight (23 kg/m²) | Heavy (35-40 kg/m²) | Medium (20 kg/m²) | Very heavy (≥50 kg/m²) |
| Installation Ease | Easy (standard tools, fits curved surfaces) | Difficult (heavy, requires special lifting equipment) | Easy but fragile | Complex (two-step process: shotcrete + coating) |
| Service Life | ≥60 years | 30-40 years | 15-20 years | 10-15 years (coating needs reapplication) |
| Maintenance Cost | Low (easy to clean/replace panels) | High (difficult to repair cracks) | High (frequent replacement due to moisture damage) | Very high (regular coating maintenance) |
Our Factory
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
Q: What is the 18mm MGO Board for tunnel/underground construction?
Q: What are its key advantages for underground use?
A1-class fireproof (≥2-hour resistance, no toxic fumes);
Excellent moisture/mold resistance (water absorption ≤12%);
Lightweight (23 kg/m²) yet impact-resistant (flexural strength ≥9 MPa);
Corrosion-neutral (safe for steel structures) and 60+ year service life.
Q: Which tunnel/underground scenarios is it suitable for?
Q: What are the key installation precautions?
Q: Does it meet international standards?
Q: Are customization options available?
Q: What is the fire resistance rating of fireproof wall board?
Q: What is the price situation of these wall panels?
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