MgO Board Guide
Magnesium oxide board is a mineral-based construction panel selected where fire performance, moisture tolerance and dimensional stability matter. Sulfycor manufactures magnesium oxysulfate boards for wall, subfloor, panel and interior applications.
Practical Advantages
A credible MgO board specification connects every advantage to the selected product and assembly. The following benefits should be reviewed with the relevant test evidence and installation detail.
Mineral-based MgO boards can provide useful reaction-to-fire performance. Sulfycor holds EN 13501-1 Class A1 and ASTM E84 FSI 0 / SDI 0 results for corresponding samples. A board classification is not a fire-resistance duration for a complete wall, floor, SIP or duct assembly.
Appropriately selected MgO boards can tolerate moisture better than paper-faced interior boards in many applications. They are not automatically waterproof or suitable for permanent weather exposure; membranes, drainage, coatings and joint details remain part of the design.
Formulation, curing, thickness, storage and exposure all influence board movement and edge stability. Select the board and installation detail together, and keep boards flat, dry and protected before installation.
Flexural, impact and fastener performance can support demanding wall, floor and panel roles when the tested thickness and construction match the project. Review the relevant report instead of relying on a generic “MgO” description.
Boards can be cut, drilled and fastened with tools selected for the thickness and dust-control plan. Gaps, fastener type, spacing, edge distance and joint treatment are assembly-specific. Review the installation guide.
Non-woven, sanded, HPL and melamine surfaces allow the board system to serve substrate, facing and finished-wall roles. Surface choice must follow the end use, finish, exposure and installation method.
Material Definition
MgO boards can use different magnesium-salt binder systems. Sulfycor manufactures magnesium oxysulfate (MOS) boards formed from reactive magnesium oxide, magnesium sulfate and water.
This distinction identifies the binder system, but formulation alone is not proof of installed performance. Product data, test scope, quality control and the complete assembly still need to be reviewed.
Specification Check
Application Fit
The application determines which benefit is relevant and which board construction should be reviewed. Use the dedicated application pages for assembly-specific guidance.
Review wall role, exposure, framing, fasteners, membranes and cladding together.
Confirm loading, span, support, thickness, joints and finished-floor requirements.
Match facing thickness and surface to the core, adhesive, press process and panel duty.
Select a substrate or finished decorative board according to the wall build-up and finish.
Separate the structural wall-layer requirement from the finished interior surface.
Use only the board and complete duct construction supported by the required evidence.
Product Selection
Sulfycor supplies three product systems rather than one generic board for every construction role.
For specified sheathing, SIP facing and fire-rated ductwork roles.
For specified underlayment and structural subfloor assemblies.
Melamine- or HPL-faced panels for finished interior and modular-house walls.
Quality Evidence
Results apply to the samples or assemblies tested. Sulfycor confirms the report scope against the proposed board, thickness and intended application.
A board-level classification does not establish the fire-resistance duration, acoustic rating, thermal performance or structural capacity of a completed assembly.
Limitations
A balanced benefits page should also explain what MgO board does not guarantee. This helps buyers avoid choosing a board from a headline alone.
Frequently Asked Questions
Common reasons for specifying an appropriate MgO board include reaction-to-fire performance, moisture tolerance, dimensional stability, physical durability and a choice of surfaces. Each benefit must be checked against the product and assembly.
“Fireproof” is too broad. A board may have a reaction-to-fire or surface-burning result, while the fire-resistance duration of a wall, floor or duct depends on the tested complete construction.
No board should be treated as a complete waterproofing system. MgO board can provide useful moisture resistance, but exposure, membranes, coatings, drainage, joints and edge details still need to be designed.
No. Binder formulation, raw materials, reinforcement, curing, density, thickness and surface treatment can all change performance. Evaluate the proposed product rather than the category name alone.
The mineral board itself does not provide the same paper-faced or wood-based food source as some alternatives. That does not replace moisture management, pest control or complete-building detailing.
There is no universal winner. The relevant comparison depends on fire requirements, moisture exposure, weight, strength, installation, finish, documentation, local acceptance and total project cost.
The Next Step
Tell us the intended application and required board role. We will identify the relevant product series and confirm what documentation is available for review.
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