... .widely used 3.different grades 4, high quality Magnesium oxide is bending, pressure, high intensity, gas hard ... technology advances, more extensive use of magnesium oxide. Magnesium oxide is making firecrackers firecrackers special materials. Magnesium oxide (MgO) commonly known ... as magnesite, calcined powder, magnesium oxide powder. Density of 2.94, a white powder. Melting point ...