Tributyl phosphate Structure Tributyl phosphate Chemical Properties Melting point -79 °C Boiling point 289 °C density 0.979 g/mL at 25 °C(lit.) vapor density 9.2 (vs air) vapor pressure 27 mm Hg ( 178 °C) refractive index n20/D 1.424(lit.) Fp 380 °F storage temp. Store below +30°C. solubility water: soluble1ml in 165ml water form Liquid color Clear Water Solubility 0.6 g/100 mL