It depends on the type of board. We produce both magnesium sulfate boards (chloride-free) and magnesium chloride boards (contain chloride).

However, our chloride-based MgO boards undergo an advanced soaking treatment that removes excess chloride ions. As a result, they do not exhibit issues such as salt blooming, corrosion of metal structures, or damage to other materials during use.

👉 See differences of magnesium sulfate board and magnesium chloride board