Magnesium Oxysulfate Board(also known as MOS Board,MgSO₄Board)is a type of magnesia cement material,made from active magnesium oxide(MgO)and magnesium sulfate(MgSO₄)solution,reinforced with alkali-resistant fiberglass mesh,and blended with lightweight fillers such as perlite and plant fibers.Unlike traditional magnesium oxychloride boards,MOS Board contains no chloride ions and is non-corrosive to steel.
