Magnesia contributes to many industrial applications.  Two dozen industrial applications for magnesia are listed at this link.

Flame retardants are chemical additives used in plastics, coatings, and other products to inhibit flame sustenance.  Magnesium hydroxide is used with a resin or similar base material as a flame retardant filler.  This magnesia compound is physically mixed with the base material ( and “additive flame retardant”).