Tetrabromophthalic anhydride diol is a reactive flame retardant intermediate mainly used for flame-retardant rigid foam. Its appearance is an amber viscous liquid. It is mainly used as a reactive flame retardant for the production of Class I and Class II polyurethane rigid Bubble (PUR). The foam material containing tetrabromophthalic anhydride diol has very low smoke generation and flame spread speed. The foam material processed by it can obtain excellent physical properties and relatively low cost. It can also be used to produce flame-retardant polyurethane gaskets. , Elastomer materials, coating adhesives and textiles.