Why Magnesium Oxysulfide (MOS) Boards are Replacing Traditional MgO Boards in Fireproof Cladding?

 In modern commercial construction, data centers, and industrial facilities, structural fireproofing and wall cladding require materials that balance fire safety, mechanical strength, and long-term durability. While traditional Magnesium Oxychloride (MOC) boards—commonly known as standard Magnesium Oxide (MgO) boards—have long been popular, industry professionals are rapidly upgrading to Magnesium Oxysulfide (MOS) boards.

MOS technology solves the critical moisture absorption, weeping, and metal corrosion issues historically associated with traditional MgO boards, setting a new benchmark for fireproof cladding and structural subfloor panels.

Key Reasons MOS Boards are Replacing Traditional MgO Boards

1. Zero Halogenation & Moisture Resistance (No "Sweating")

Traditional MOC/MgO boards contain free chloride ions (Cl) that readily absorb ambient atmospheric moisture. In humid environments, this causes the boards to "weeping" or "sweat" (halogenation), leading to surface degradation and mold growth. MOS boards do not absorb moisture or weep, maintaining structural integrity even in high-humidity zones, underground spaces, or coastal regions.

2. Complete Protection Against Metal Corrosion

When traditional chloride-based MgO panels come into contact with steel studs, aluminum frames, or raised floor pedestals, free chloride ions accelerate galvanic corrosion, causing structural failure over time. MOS boards use a sulfate formulation that is 100% chloride-free, completely eliminating the risk of metal fastener corrosion.

3. Superior Dimensional Stability & Thermal Performance

Unlike calcium silicate or fiber cement panels that can warp under extreme heat, MOS boards offer exceptional dimensional stability. They exhibit minimal thermal expansion and contraction, preventing cracks in interior/exterior decorative wall cladding and floor panel joints.

4. A1-Class Fire Rating & Eco-Friendly Composition

MOS panels carry an A1 non-combustible fire rating. Under extreme temperatures, they do not burn, release toxic fumes, or generate heavy smoke. Furthermore, they are completely free of asbestos, formaldehyde, organic solvents, and heavy metals.

Side-by-Side Comparison: MOS vs. Traditional MgO (MOC) Boards

Feature / Property	Magnesium Oxysulfide (MOS) Board	Traditional MgO / MOC Board
Primary Salt Solution	Magnesium Sulfate (MgSO4)	Magnesium Chloride (MgCl2)
Free Chloride Content	0% (Chloride-Free)	High (Contains free Cl)
Moisture / Sweating Issue	None (No Halogenation)	High risk in humid environments
Metal Fastener Corrosion	Zero Corrosion Risk	High risk of rusting screws/frames
Fire Resistance Rating	A1 Class Non-Combustible	A1 Class Non-Combustible
Weathering & Durability	Excellent (Long-term stability)	Moderate (Degrades under moisture)
Ideal Applications	Cladding, Raised Floors, Cleanrooms	Dry interior partitions

 

 

Primary Applications of MOS Fireproof Boards

Fireproof Interior & Exterior Cladding: Used as decorative wall panels, interior partition boards, and curtain wall backing panels in high-rise commercial buildings, hospitals, and cleanrooms.

Raised Access Floor (RAF) Panels & Subfloors: Applied as high-density, fireproof core panels or subfloor boards in data centers and server rooms to support heavy equipment without risk of rusting underfloor pedestals.

 

Modular & Prefabricated Buildings: Replaces heavy cement boards and moisture-sensitive plywood, significantly lowering dead load while accelerating prefabricated assembly.

Fire-Rated Ceilings & Enclosures: Used for fire-resistant ductwork enclosures, shaft walls, and drop-ceiling systems requiring strict fire barrier compliance.

Selection and Installation Best Practices

Verify Sulfate Purity: Ensure the manufacturer specifies a true 100% sulfate-based (MgSO4) formulation with zero added chloride salts.

Density Selection: For decorative wall cladding, choose densities around 0.9g/cm3 - 1.1g/cm3. For heavy-duty subfloor or raised access floor applications, specify high-density MOS panels (1.25g/cm3).

Joint Treatment: Use specialized fire-rated, flexible joint compounds and alkali-resistant fiberglass tape at panel connections to accommodate structural settling and thermal movement.

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Why Magnesium Oxide (MgO) Boards are Revolutionizing Raised Access Floor Systems?

 Modern data centers, commercial offices, and modular buildings demand high-performance flooring solutions that combine structural strength, fire safety, and environmental sustainability. Among emerging materials, Magnesium Oxide (MgO) boards have become the premier choice for Raised Access Floor (RAF) systems, outperforming traditional calcium silicate, cement, and particle board alternatives.

What is an MgO Board Raised Floor System?

A Magnesium Oxide board raised floor system utilizes high-density, glass-fiber-reinforced MgO boards either as a direct modular subfloor panel or as the high-strength core material enclosed within steel-encapsulated anti-static floor tiles. Because of its exceptional non-combustible properties and high load-bearing capacity, it bridges the gap between lightweight wood panels and heavy concrete/calcium silicate boards.

Key Advantages of MgO Boards in Raised Flooring

A1-Rated Fire Resistance: MgO boards are completely non-combustible. In server rooms and data centers where fire safety is paramount, they prevent flame propagation and do not emit toxic smoke under high heat.

Superior Load-Bearing Capacity: High-density MgO boards (typically ranging from 1.20g/cm3 to 1.40g/cm 3) reinforced with multi-layer fiberglass mesh provide exceptional concentrated load and impact resistance without sagging.

Moisture and Mold Resistance: Premium sulfate-grade MgO boards do not warp, swell, or degrade in high-humidity environments, making them ideal for sub-grade spaces and tropical climates.

Acoustic Damping: MgO panels possess natural sound-dampening qualities, significantly reducing hollow echoes and impact noise in commercial office environments.

Eco-Friendly and Safe: Free from asbestos, formaldehyde, and hazardous volatile organic compounds (VOCs), MgO boards offer a sustainable, green-building-certified flooring substrate.

Recommended Thickness and Applications

Choosing the correct thickness depends on the specific raised floor application and load requirements. The industry standards are outlined below:

Application Type	Recommended Thickness	Primary Use Case & Characteristics
Direct Subfloor Panel	18 mm – 20 mm	Standard commercial offices, modular buildings; lightweight, reduces dead load on building structures.
Heavy-Duty Subfloor Panel	22 mm – 25 mm	High-traffic corporate lobbies, conference centers, libraries; offers rigid footfall feel and enhanced load capacity.
Raised Floor Core Material	25 mm – 32 mm	Data centers, server rooms, control rooms; used as the internal core sandwiched between steel plates with HPL/PVC finishes.
Industrial / Specialized	28 mm – 30 mm+	Heavy industrial cleanrooms, equipment utility rooms, heavy-load service corridors.

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What is a T&G Floor Fiber Cement Sheet (2700x600x19mm)?

 Fiber cement is an engineered composite material made from Portland cement, sand, water, and cellulose fibers. When manufactured into heavy-duty flooring sheets with a Tongue and Groove (T&G) edge profile, it provides a seamless interlocking system designed to distribute weight evenly across floor joists.

The specific dimensions—2700mm x 600mm x 19mm—are meticulously engineered to fit standard framing intervals, reduce installation waste, and provide a rigid, heavy-duty platform suitable for a wide range of floor finishes.

Key Technical Advantages of 19mm T&G Fiber Cement Sheets

1. Exceptional Moisture and Water Resistance

Unlike traditional wood-based subflooring materials (such as particleboard or standard plywood), fiber cement does not warp, swell, rot, or delaminate when exposed to moisture. This makes the 19mm T&G sheet an ideal substrate for wet areas such as bathrooms, laundries, kitchens, and commercial washrooms.

2. Superior Fire Performance

Safety is paramount in modern architecture. Fiber cement sheets are non-combustible and carry top-tier fire ratings. Installing a 19mm fiber cement subfloor significantly enhances the passive fire protection of a building, meeting stringent international building codes.

3. Acoustic Insulation and Solid Feel

At 19mm thick, this heavy-duty sheet adds substantial mass to the floor assembly. This increased mass effectively dampens impact noise and airborne sound transmission between multi-story levels, delivering the solid, squeak-free feel of a concrete slab combined with the ease of timber framing.

4. Seamless Interlocking T&G Edge

The Tongue and Groove profile allows adjacent sheets to lock tightly together. This ensures load transfer between panels, preventing uneven deflection and creating a smooth, stable base for final floor coverings like tiles, vinyl, engineered wood, or carpet.

Ideal Applications

The 2700x600x19mm fiber cement flooring is versatile and performs exceptionally well in demanding environments:

Residential Homes: Perfect for second-story additions, wet-area flooring, and heavy traffic zones.

Commercial Buildings: Ideal for offices, retail spaces, and educational institutions where high live loads and durability are required.

Modular and Prefabricated Construction: Its dimensional stability and uniform sizing make it a favorite for off-site modular builders looking for reliable subfloor panels.

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Why Choose Fiber Cement Rainscreen Cladding? (Key Benefits)

 Compared to traditional masonry, metal composite panels (ACM), or standard EIFS, fiber cement rainscreen systems offer a distinct combination of structural resilience and design flexibility:

Superior Fire Safety: Premium fiber cement panels typically achieve A2-s1,d0 non-combustible ratings (in accordance with EN 13501-1 / ASTM E136), making them compliant with stringent high-rise and commercial building fire codes.

Exceptional Durability & Longevity: Manufactured using high-pressure autoclaved technology (combining cement, cellulose fibers, and selected minerals), these panels resist rotting, warping, UV degradation, and freeze-thaw cycles, offering a service life exceeding 30 years with minimal maintenance.

Enhanced Thermal Performance: By decoupling the cladding from the building structure and integrating continuous exterior insulation within the ventilated cavity, the system drastically reduces thermal bridging and supports Passive House standards.

Unmatched Design Freedom:

Finishes & Textures: Available in through-colored (homogenous) variants, factory-applied coatings, sanded textures, and custom tones mimicking raw concrete, timber, or stone.

Format Flexibility: Large-format panels or narrow planks can be cut, perforated, and installed horizontally or vertically for dynamic architectural expressions.

Typical Applications

Driven by their rigorous performance profile and aesthetic adaptability, fiber cement rainscreens are widely specified across diverse sectors:

Commercial & Corporate Headquarters: Delivering sleek, timeless corporate identities with low life-cycle costs.

Educational & Institutional Facilities: Offering superior impact resistance, sound insulation, and long-term weathering resistance.

Healthcare & Laboratories: Providing hygienic, moisture-resistant exterior surfaces that withstand rigorous cleaning and environmental demands.

Multi-Family Residential: Enhancing occupant safety, energy ratings, and curb appeal.

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Why Modern MgO Subflooring is Non-Corrosive？

 The non-corrosive nature of premium MgO subfloor panels relies entirely on their chemical matrix:

  Magnesium Sulfate Formulation (): By replacing Magnesium Chloride () with Magnesium Sulfate, the manufacturing process eliminates free chloride ions.

  Zero Leaching: Sulfate-based boards do not exhibit hygroscopic (moisture-attracting) pulling of ambient water in high-humidity zones. Because the board stays dry internally and lacks chlorides, it will not degrade or corrode steel joists, light-gauge steel framing, or subfloor fasteners.

  Acoustic & Structural Integrity: The resulting matrix is a dense, crystalline structure that provides excellent shear strength and acoustics without compromising the surrounding metal infrastructure.

For structural subfloor applications (such as modular construction, multi-family mid-rises, or heavy-duty commercial spaces), non-corrosive MgO boards typically conform to the following engineering profiles:

Property	Typical Specification
Standard Thicknesses	15mm, 18mm, 20mm
Edge Profile	Tongue & Groove (T&G) or Square-Edge (S-Edge)
Density	High Density ( to )
Fire Rating	Class A1 (Non-combustible) / ASTM E136
Flexural Strength	High structural capacity (capable of meeting span ratings for 16" or 24" on-center joist spacing) More iinformation, please visit at www.hocre-board.com or send message by whatsapp +86 15001321220

MgO T&G Panels vs. Traditional Subfloors

 When comparing Magnesium Oxide (MgO) Tongue & Groove (T&G) Panels to traditional subflooring materials—primarily Oriented Strand Board (OSB) and Plywood—the choice comes down to a balance between high-performance durability and upfront material costs.

MgO panels have rapidly gained traction in commercial, modular, and high-end residential builds due to their superior material properties. Here is a detailed breakdown of how they stack up against traditional options.

Technical Performance Comparison

Feature	MgO T&G Panels	Traditional Subfloors (OSB / Plywood)
Fire Rating	Class A1 / Flame Spread 0 (Non-combustible)	Combustible (Requires additional fire-rated underlayments)
Moisture Resistance	Excellent; does not delaminate, swell, or rot	Poor to Moderate; prone to edge-swelling and delamination
Mold/Pest Resistance	Naturally immune to mold, termites, and wood-boring insects	Vulnerable unless heavily chemically treated
Dimensional Stability	High; minimal expansion/contraction	Moderate; prone to warping, cupping, and squeaking over time
Environmental Impact	Low carbon footprint; captures  during curing; formaldehyde-free	Higher VOC emissions (glues/resins); intensive logging

 

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Magnesium Oxide (MgO) cladding panels

 

Magnesium Oxide (MgO) cladding panels are high-performance exterior and interior wall systems that have become a preferred alternative to traditional fiber cement, stucco, and wood cladding. Composed of magnesium oxide, natural minerals, and fiberglass mesh reinforcement, these panels offer ultimate structural protection.

Key Advantages of MgO Exterior Cladding

• A1 Fire Resistance: MgO is completely non-combustible. It has zero flame spread and smoke development ratings, allowing assemblies to easily hit 1-hour to 2-hour fire ratings under rigid ASTM/UL configurations.
• Weather and Vapor Control: Unlike legacy timber or gypsum products, high-quality MgO sheathing does not warp, swell, rot, or delaminate when exposed to heavy driving rain, moisture, or freeze-thaw cycles. It maintains excellent vapor permeance, helping the building envelope dry efficiently.
• Impact Strength: MgO panels carry significantly higher flexural and tensile strength than fiber cement boards, providing exceptional wind-load resistance and durability against harsh physical wear.
• Eco-Friendly Integrity: Manufactured through low-energy processes, MgO boards act as a carbon sink during curing and contain zero toxic resins, formaldehyde, heavy metals, or dangerous crystalline silica dust

Mgo cladding panel  thickness： 12mm, 14mm, 15mm, 16mm

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