Modified Magnesium Oxide (MgO) boards are specialized building materials engineered to overcome the historical weaknesses of standard MgO panels—specifically "crying" (leaching moisture) and salt-related corrosion. High moisture resistant versions typically utilize a Magnesium Sulfate (MgSO4) chemistry rather than the traditional Magnesium Chloride (MgCl2).
The Chemistry: Sulfate vs. Chloride
The primary factor in moisture resistance is the bonding salt used during the manufacturing process.
- Standard MgO (Chloride): Highly hygroscopic. In humid environments, chloride ions can absorb atmospheric moisture, leading to "sweat" on the board surface. This moisture is often acidic and can corrode metal studs, screws, and fixings.
- Modified MgO (Sulfate): By replacing chloride with sulfate, the board becomes much more stable in high-humidity zones. It does not absorb water from the air, effectively eliminating the risk of leaching and metal corrosion.
Key Performance Characteristics
High-quality modified MgO boards are designed for harsh environments like tunnels, coastal areas, and exterior facades.
| Feature | Performance Specification |
| Fire Rating | Non-combustible, often achieving Class A1 (EN 13501-1). |
| Moisture Stability | Minimal linear expansion even when fully saturated. |
| Durability | Resistant to mold, mildew, and termites; does not rot or disintegrate. |
| Mechanical Strength | High flexural strength; suitable for high-impact zones. |
| Eco-Friendly | Low carbon footprint; typically free of asbestos, formaldehyde, and silica. |
More information, Please visit at www.hocre-board.com or send message by whatsapp +86 1501321220
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