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Tunnel environments are uniquely harsh, characterized by constant moisture, piston-effect air pressure from passing vehicles, and the necessity for high fire resistance.

Key Technical Requirements

1. Fire Performance & Passive Protection

In a tunnel, a fire can reach extreme temperatures very quickly (the RWS curve or HCinc curve). Tunnel boards must be Class A1 Non-combustible.

• Thermal Insulation: The board must protect the structural concrete or steel lining from “spalling” (where moisture in concrete expands and causes the surface to explode).
• Toxic Fumes: They must be ...

One of the primary safety advantages of fiber cement board is its behavior under extreme heat. Because it is composed of inorganic materials—primarily Portland cement, sand, and cellulose fibers—it is naturally non-combustible.

Here is a breakdown of why fiber cement is considered a safe choice for fire-rated assemblies:

Fire Performance Characteristics

• No Toxic Off-gassing: Unlike wood-based panels (which release carbon monoxide and smoke) or certain plastic-based composites and EPS-core panels (which can release toxic fumes like hydrogen cyanide or thick black smoke), fiber ...

To ensure durability in environments with high moisture, chlorides (coastal areas), and sulfur (industrial zones or volcanic regions), the selection of the board’s chemical composition and density is critical.

Standard fiber cement or common MgO boards may struggle under these specific conditions without the right additives or manufacturing processes. Here is a breakdown of the most resilient options:

1. High-Density Fiber Cement (HDFC)

Autoclaved, high-density fiber cement is generally the “gold standard” for moisture and atmospheric resistance.

• Chloride/Sulfur Resistance: HDFC is chemically inert once ...

MgO Sulfate board is an excellent choice for a roof substrate, particularly in high-performance or fire-rated roofing systems. Because it is chloride-free, it avoids the structural risks associated with traditional MgO boards when they come into contact with metal roof components.

Role as a Roofing Substrate

In a roofing assembly, the MgO Sulfate board acts as the rigid deck or recovery board. It provides a flat, stable surface for the final waterproofing layer.

• System Compatibility: It is compatible with most common roofing ...

The primary reason to choose Magnesium Oxysulfate (MgO Sulfate) board over the more common Magnesium Oxychloride (MgO Chloride) board—especially in roofing and structural applications—comes down to a single chemical enemy: Chlorides.

While both are “MgO boards,” their performance in real-world environments is drastically different. Here is the technical breakdown:

1. The “Sweating” Problem (Efflorescence)

Regular MgO Chloride boards are hygroscopic, meaning they naturally absorb moisture from the air.

• Chloride Board: When the board absorbs moisture, the free chloride ions react to form a ...

Matte finish fiber cement panels are a top-tier choice for modern architecture, offering a sophisticated, “stony” aesthetic without the gloss or glare of metal or plastic composites. They provide a muted, organic look that shifts beautifully with natural light.

Key Characteristics

• Aesthetic: Non-reflective, flat finish. It emphasizes the raw texture of the cement and the building’s form.
• Durability: Fiber cement is a composite of sand, ...

When choosing between Through-Colored (Integrally Pigmented) and Painted (Surface Coated) fiber cement, the decision usually comes down to a trade-off between “natural material honesty” and “perfect color uniformity.”

Here is a breakdown of why through-colored boards are generally considered the premium choice for modern architecture.

1. Durability and Damage Control

• Through-Colored: Because the pigment is mixed into the wet slurry, the color goes all the way through. If a panel is scratched by a stray branch or chipped during installation, the ...

A “translucent/matte through-colored smooth fiber cement facade” describes a high-end architectural cladding system that balances raw material honesty with a refined, modern finish.

While fiber cement itself is inherently opaque, the term “translucent” in this industry typically refers to the top coating or the visual “depth” of the panel, rather than the board being see-through like glass.

 Key Characteristics

• Through-Colored (Integrally Pigmented): The color is mixed into the wet cement paste before the board is formed. If the panel is scratched or ...

Through-colored, sanding-textured fiber cement is a high-performance facade material where the pigment is integrated throughout the entire panel. Unlike surface-painted boards, the color is consistent from the face to the core, and the surface is mechanically sanded to create a raw, tactile aesthetic.

Key Characteristics

• Through-Colored: The color pigments are mixed into the “slurry” before the board is pressed. This means ...

When comparing Fiber Cement and MgO Sulfate (MOS) Board for facades, the choice often comes down to a trade-up between proven aesthetic durability (Fiber Cement) and superior technical safety/handling (MgO Sulfate)

While both are non-combustible alternatives to wood or plastic, they behave very differently in real-world exterior conditions.

Technical Comparison Table