What is Magnesium Sulfate (MgSO4) Board?
Unlike the older generation of Magnesium Oxide (MgO) boards which used Magnesium Chloride (MgCl2) as a binding agent, the Sulfate version utilizes Magnesium Sulfate (MgSO4). This chemical shift was engineered to solve the “crying” or “sweating” phenomenon—where chloride-based boards absorb environmental moisture and leach corrosive salt water.
The Significance of the A1 Fire Rating
The A1 Rating is the highest classification under the European Standard EN 13501-1. It signifies that the material is non-combustible and provides:
- No contribution to fire: The board will not ignite or fuel a flame.
- No smoke production: Essential for maintaining visibility and air quality during evacuation.
- No flaming droplets: Prevents the spread of fire to lower levels or adjacent structures.
Chloride-Free (Anti-Corrosion): With chloride levels typically below 0.05%, these boards are safe for use with light-gauge steel framing and standard fasteners without the risk of rapid oxidation.
Dimensional Stability: MgSO4 boards exhibit minimal expansion and contraction, making them ideal for large-scale facade cladding and roofing sub-layers.
Water Resistance: They maintain their structural integrity even when saturated, making them suitable for high-humidity environments or projects where the structure may be exposed to weather during construction.
Health & Safety: Being asbestos-free, silica-free, and low-VOC, they contribute to healthier indoor air quality and are easier for workers to handle during drilling and screwing trials.
APR
2026