The global magnesium hydroxide market is expected to grow from USD 820 million in 2025 to USD 1.23 billion by 2031, at a CAGR of 7.03% over the 2026-2031 forecast period, according to Mordor Intelligence. Magnesium hydroxide is an inorganic compound used as a flame retardant, smoke suppressant, acid acceptor and pH regulator across polymers, water treatment and chemical processing, including PVC stabilizer formulations.

Magnesium hydroxide acts as a halogen-free flame-retardant filler and smoke suppressor in PVC, rubber and plastics, and as an acid acceptor and thermal-stability auxiliary in PVC heat stabilizer systems, while serving broadly in water treatment, flue-gas treatment and neutralization. Demand is tied to tightening fire-safety standards, the growth of halogen-free flame-retardant formulations and sustained use across environmental and industrial applications. Asia-Pacific is the largest and fastest-growing region, supported by extensive PVC, construction and environmental industries in China, India and Southeast Asia.

North America and Europe sustain steady demand in water treatment and high-purity applications. Continued fire-safety and PVC growth positions magnesium hydroxide as a steadily advancing flame-retardant and stabilizer auxiliary.