Introduction
Magnesium oxide boards (commonly known as MgO boards) are gaining popularity in construction for their fire resistance, moisture protection, and eco-friendly properties. Also referred to as glass magnesium boards, they are widely used in both residential and commercial projects.
There are two main types of MgO boards available today: magnesium sulfate boards (MgSO₄ boards) and magnesium chloride boards (MgCl₂ boards). Choosing the right one can impact the quality, safety, and longevity of your building project. In this article, we’ll explore the key differences between MgO Boards, MgSO₄ and MgCl₂ boards.
MgO Boards
MgO boards, full name magnesium oxide boards, are also called glass magnesium boards or just magnesium boards. There are mainly two types of MgO board: MgSO₄ board and MgCl₂ board. The main difference lies in ingredients.
Magnesium oxide boards are widely used in modern construction due to their excellent fire resistance, moisture resistance, mold resistance, and versatility. They are ideal for both residential and commercial applications, including walls, ceilings, floors, and SIP panels. Compared with traditional gypsum or cement boards, MgO boards offer a lighter, stronger, and more eco-friendly solution, making them increasingly popular among contractors and architects.
MgSO4 Board
Also known as magnesium sulfate board, is currently the most popular and the most widely used one on the market. Suparna is also producing this type mainly.
Magnesium sulfate boards are considered more stable and reliable, especially in humid environments. They are made using magnesium oxide, magnesium sulfate (instead of chloride), perlite, wood fiber, and other additives. The absence of chloride significantly reduces the risk of moisture absorption, corrosion to embedded metals, or “sweating” phenomena, which has been a historical issue with chloride-based boards.
Suparna MgSO₄ boards are produced under strict quality control to ensure consistent performance, including excellent dimensional stability and resistance to cracking or delamination. These features make them ideal for international markets with strict building material standards.
MgCl2 Board
MgCl₂ board, known as magnesium chloride board, is the earliest type active on the market.
However, it may have serious problems with inappropriate production process. Since 2010 Denmark has witnessed a great loss of over EUR100 million caused by unqualified MgO “sweating board”. Since then, people prefer magnesium sulfate board than magnesium chloride board.
The “sweating” problem—caused by chloride leaching and moisture absorption—can lead to corrosion of screws, metal framing, or electronic equipment, and has resulted in building failures in Europe. This caused many countries and professionals to move away from magnesium chloride-based boards, especially when sourced from low-quality suppliers.
Luckily, we have solved this problem using the soaking technology. Now both types of Suparna MgO Board have similar performance.
Thanks to Suparna’s proprietary soaking and curing technology, we are able to significantly reduce the free chloride content in MgCl₂ boards, improving their durability and resistance to moisture-related issues. Today, both our MgCl₂ and MgSO₄ boards pass rigorous tests and meet international safety and performance standards. This gives our clients more flexibility in choosing the right product based on cost, availability, or project-specific requirements.
Conclusion
While MgCl₂ boards were the earliest form of MgO board on the market, improper manufacturing has led to moisture-related failures, especially in humid environments — a problem that has cost builders millions in damages. In contrast, MgSO₄ boards offer greater stability, reliability, and acceptance in international markets.
Thanks to Suparna’s innovative soaking technology, we’ve successfully overcome the limitations of traditional MgCl₂ boards, making both board types stable and high-performing. Whether you prioritize fire safety, durability, or long-term cost efficiency, Suparna MgO Boards are a smart and safe choice for any construction project.
Contact us today to get samples, pricing, or technical consultation — and build with confidence using the best MgO boards in the market.
