Aluminum hydroxide is the most widely used inorganic flame retardant additive. As a flame retardant, aluminum hydroxide can not only be flame retardant, but also prevent smoking, no dripping and no toxic gas. Therefore, it has been widely used. Scope of application: thermosetting plastics, thermoplastics, synthetic rubber, coatings, building materials and other industries. At the same time, aluminum hydroxide is also the basic raw material of aluminum fluoride necessary for electrolytic aluminum industry, and aluminum hydroxide is also widely used in this industry.