Diol of Tetrabromophthalic Anhydride Chemical Name: Diol of Tetrabromophthalic Anhydride Brand Name:RK-628 Equivalent Brand:PHT-4 Diol CAS NO.: 20566-35-2 Chemical Formula: C15H16O7Br4 Molecular Weight: 627.8 Application: RK-628 is a reactive flame retardant, flame retardant mainly used for hardness polyurethane foams, adhesives and coatings. RK-628 is a reactive flame retardant, mainly for the hardness of the polyurethane foam flame retardant adhesives and coatings. This product has the characteristics of high temperature and precipitation, non- corrosive metal surface, does not interfere with the stability of the catalyst. Soluble in alcohol, toluene, acetone, insoluble in water.