properties value cas number 868077-29-6 molecular formula c18h22brn molecular weight 309.31 g/mole appearance white to white powder density 1.16 g/cm ³ melting point 120-130 ℃ solubility dissolve in most organic solvents physical and chemical properties use u-cat 5003 is a quaternary phosphonium bromide catalyst used for curing epoxy resins. it is a fast curing accelerator...