MgO boards are primarily made from magnesium oxide (MgO) derived from magnesium-rich minerals. Magnesium chloride (MgCl2) acts as a binding agent when dissolved in water, providing cohesion. Fibers, such as cellulose or fiberglass, enhance strength and flexibility. Fillers like perlite or vermiculite can improve specific properties. Reinforcements, like glass fiber mesh, increase structural integrity. Water is added for mixing and hydration. These ingredients combine to create versatile MgO boards.