Fire-Rated MgO Board for Roof Sheathing from China Manufacturer

Product Detail
Specifications
Applications
FAQ

01 / Product Positioning

Fire-Rated MgO Board for Roof Sheathing

The board is intended as a lining or sheathing component beneath a complete roof covering, membrane or panel system. It contributes a non-combustible inorganic layer and a workable substrate for factory or site assembly.

02 / Application-specific value

Advantages for Roof Sheathing

Roof Lining & Sheathing Solution

Designed as a lining or sheathing component beneath complete roof coverings, membranes, or panel systems.

Non-Combustible Inorganic Layer

Provides certified non-combustible protection for enhanced fire safety in roofing assemblies.

Flexible Assembly Compatibility

Offers a workable substrate suitable for both factory and site assembly methods.

Complete Technical Specifications

Includes configurable roof type, support spacing, panel orientation, design load, slope, membrane/covering selection, insulation, condensation-control strategy, edge details, and exposure conditions.

Inorganic sulfate MgO core, reinforcing layers and finishing surfaces for roof sheathing construction

03 / Composition and surface options

Inorganic core, reinforcing layers and finishing surfaces

The MgO board forms one layer of a roof build-up and should remain protected by the specified weathering system. Structural span, wind uplift, drainage and water tightness belong to the complete roof design.

04 / Key features

Performance defined for the confirmed model

Feature	Final Product Information
Reaction to Fire	A1 non-combustible; the fire-resistance period of the complete product or system remains subject to assembly validation.
Chloride Ion	≤0.01%; the low-chloride magnesium-sulfate system helps reduce halogen reversion, moisture uptake and metal-corrosion risk, with a contractual 100% no-halogen-reversion commitment.
Indoor environment and configurable properties	Formaldehyde-free, asbestos-free and AQ1 smoke-toxicity classification. Flexural strength and screw-holding can be customized by thickness, product construction and project requirements, subject to confirmed model data.
Product boundary	The board is not a finished weather-exposed roof and should not be assigned an unsupported structural span without project-specific validation.

Model-specific dataPerformance follows the technical data and reports for the confirmed model.

System-level boundaryPanel data does not replace complete-wall validation.

Document alignmentSample name, thickness, density and surface should match the supplied model.

05 / Specifications and custom options

Standard supply range with configurable mechanical performance

Standard supply range and custom options of Fire-Rated MgO Board for Roof Sheathing: panel size, thickness, surface, color, density and mechanical performance

Item	Standard Range or Customization
Panel Size	1220×2440, 1220×2700, 1220×3050 mm
Thickness	Customizable from 5 to 30 mm; roof-lining thickness is selected according to supports, covering layers and project validation.
Surface	Non-woven or sanded.
Color	Regular white; gray, yellow and red by discussion
Apparent Density	0.95-1.15 g/cm³
Flexural strength	Customizable by thickness, construction and project requirements; subject to confirmed model data.
Screw holding	Customizable by thickness, construction and project requirements; subject to confirmed model data.
Reaction to fire	A1
Smoke toxicity	AQ1
Chloride ion	≤0.01%
Anti-halogen	A 100% no-halogen-reversion commitment may be written into the contract, with threefold compensation applied according to the agreed terms if verified non-compliance occurs.
Formaldehyde emission	Formaldehyde-free.

06 / Common board selection comparison

Choose by project priorities, not by one claim

Roof-lining selection should compare non-combustibility, panel weight, moisture stability, edge integrity, compatibility with the membrane or covering, and flexural and fastening performance under the designed support conditions.

Common roof-lining board selection comparison: gypsum board, fiber cement board, fire-retardant plywood and fire-retardant wood board versus sulfate MgO lining board

Common Board	Fire Rating	Typical Considerations	Selection Value of Sulfate MgO Lining Board
Gypsum Board	A2 (combustible paper facing)	Moisture-sensitive; may soften or powder in damp conditions; paper facing may delaminate at high temperature.	A1 non-combustible; moisture and mould resistant; maintains better integrity at high temperature; good impact resistance.
Fiber Cement Board	A1	Heavy and brittle; prone to cracking; potential metal-corrosion concerns.	Tougher and lighter; good thermal stability; low-corrosion formulation; lower shrinkage.
Fire-retardant Plywood	B1 flame-retardant	Combustible; may delaminate when damp; fire-retardant performance may decline; formaldehyde concern.	A1 non-combustible; moisture and mould resistant; no loss of fire-retardant treatment; formaldehyde-free; impact resistant.
Fire-retardant Wood Board	B1 flame-retardant	Combustible; moisture-sensitive and prone to mould; fire-retardant additives may age.	A1 non-combustible; stable inorganic substrate; reliable performance in humid and high-temperature conditions.

Comparison statements must be checked against the actual models and equivalent test conditions. No competitor brand is implied.

Non-combustible MgO sheathing component for protected roof assemblies in modular buildings and roof systems

07 / Applications and use boundaries

A non-combustible MgO sheathing component for protected roof assemblies.

Suitable for modular-building producers, roof-system fabricators, contractors, distributors and project teams requiring coordinated roof sheathing, membrane, insulation and support details.

For actual projects, The board is not a finished weather-exposed roof and should not be assigned an unsupported structural span without project-specific validation.

Suitable Use

Dry interior, non-load-bearing partition lining with a defined wall build-up.

Requires Assembly Validation

Fire-resistance period, acoustic performance, impact resistance and fixture capacity.

Not a Standalone Solution

Load-bearing walls, continuous immersion, direct exterior exposure or heavy fixtures fixed only to the panel.

08 / Quality control, packing and delivery

Control from production batches to export protection

Massif applies process control to raw-material batches, formulation, forming, reinforcement placement, curing, cutting, panel faces, edges and packing. A reference sample can be approved and retained before mass production, followed by checks against the confirmed specification.

Production control of Fire-Rated MgO Board for roof sheathing: raw materials, forming, curing, cutting and panel finish — **Production Control**Raw materials, forming, curing, cutting and panel finish.

Model-specific technical documents and test evidence for Fire-Rated MgO Board for roof sheathing — **Model-specific Evidence**Documents should identify the model, thickness, density, surface and test scope.

Export packing protection for Fire-Rated MgO Board for roof sheathing corners, edges, surfaces and moisture-sensitive interfaces — **Export Protection**Corner, edge, surface and moisture-sensitive interface protection.

09 / Related products, thickness reference and FAQ

Different MgO board roles within the same project

MgO Board Application Thickness Reference

Application or Product	Client-confirmed Thickness Reference
Interior Partition	8-18 mm
Curtain Box	15 mm, 18 mm
Ceiling	8 mm, 9 mm, 10 mm, 12 mm
Fire-rated Air Duct	8 mm, 10 mm, 12 mm, 14 mm
Floor Slab	20-30 mm
Container or Integrated Housing Flooring	15 mm, 18 mm
Substrate for Ceramic-aluminium Acoustic Panel	14 mm
Sound Insulation Board	10 mm, 12 mm
Sanded Wall Board for Lamination	5 mm, 6 mm, 8 mm, 9 mm

These thicknesses support initial matching by application. Board construction and performance requirements vary by use; final supplied model, thickness and technical data remain subject to the applicable product confirmation.

Does "chloride-free" mean a zero chloride-ion result?

The product uses a low-chloride magnesium sulfate system to distinguish it from conventional chloride-based formulations. The confirmed technical value is chloride-ion content of no more than 0.01%; formal technical content uses this measurable value rather than claiming absolute zero chloride.

Why is this board suited to light-gauge steel-framed partitions?

Its A1 classification provides a non-combustible lining layer, while the low-chloride sulfate system helps reduce chloride-related risk around studs and screws. E0 formaldehyde emission, asbestos-free composition, and customizable flexural and screw-holding performance support different wall designs.

Can an 18 mm panel support 90 kg on any partition wall?

No. The 90 kg value is a hanging capacity that the 18 mm panel can reach under the corresponding validated conditions. Allowable fixture load also depends on fasteners, framing, edge distance, panel layers and the complete wall construction. Heavy equipment should connect to framing or designed reinforcement.

How is the 100% no-halogen-reversion commitment documented?

The mutually agreed quality requirement, applicable conditions and corresponding remedy may be included in the sales contract. Implementation remains subject to the contract terms, supplied model and applicable test or assessment conditions.

Does E0 mean that the product has absolutely zero formaldehyde emission?

No. E0 is a formaldehyde emission grade and does not mean absolute zero emission. Website copy, technical data and test documents should consistently state "Formaldehyde emission grade: E0."

What are the flexural strength and screw-holding values?

Both properties can be customized according to thickness, wall construction, framing and fastening requirements. Final values follow the technical data and test evidence for the confirmed model.

Does an A1 panel directly establish the fire-resistance period of the wall?

No. A1 describes the panel's reaction to fire. Integrity and insulation of the complete wall depend on board layers, framing, infill, joints, fastening and penetrations and require applicable assembly evidence or an approved design.

Can the roof sheathing board be used as the final exposed roof surface?

No. It is a lining or substrate within the roof assembly and must be protected by the specified membrane, covering and complete drainage details.

Jiangsu Massif Building Materials Co., Ltd.

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Fire-Rated MgO Board for Roof Sheathing

Fire-Rated MgO Board for Roof Sheathing

Advantages for Roof Sheathing

Roof Lining & Sheathing Solution

Non-Combustible Inorganic Layer

Flexible Assembly Compatibility

Complete Technical Specifications

Inorganic core, reinforcing layers and finishing surfaces

Performance defined for the confirmed model

Standard supply range with configurable mechanical performance

Choose by project priorities, not by one claim

A non-combustible MgO sheathing component for protected roof assemblies.

Control from production batches to export protection