In recent years, fire accidents caused by polymers have attracted great attention from all walks of life, and the research and development of flame-retardant polymers has become a hot topic. At present, organic flame retardants used in the market have hazards such as large smoke production and toxic smoke, which are subject to legal restrictions in Europe, the United States, Japan and my country. Therefore, inorganic flame retardants have received great attention.

Magnesium hydroxide (Mg(OH)₂) is a white crystal or powder with weak alkalinity and hygroscopicity. The part soluble in water is completely ionized, and the saturated solution concentration is 1.9 mg/L (18°C). Its preparation methods include brucite grinding method and chemical synthesis method (such as calcium hydroxide method, ammonia method, sodium hydroxide method).

With the strengthening of environmental protection, the application of magnesium hydroxide in flame retardant materials will continue to increase in the future.

Magnesium hydroxide is a white powder that is insoluble in water but soluble in strong acids and ammonium salt solutions. It has flame retardant properties, thermal stability, filling properties, and electrical insulation properties.