Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Tributyl phosphate is reported to be a colourless and odourless liquid with a melting point of below -80oC and a boiling point of 289oC (decomposition noted at 177-178oC). The relative density of tributyl phosphate is reported to be 0.9727g/cm3at 25oC. The vapour pressure of tributyl phosphate was determined using the gas saturation method and is reported to be 0.00000346 hPa at 25oC. The partition coefficient (Pow) was found to be 10100. The solubility of tributyl phosphate was determined according to the flask method and found to be 280 ppm. The surface tension of tributyl phosphate is reported in two separare reports to be 25.1mN/m and 27.55 mN/m at 20oC. The flash point of tributyl phosphate is reported to be 146oC; the auto-ignition temperature is reported to be >482oC.

The substance has a long history of use as a flame retardant and can therefore justifiably be considered to be non-flammable, non-explosive and without oxidising properties. Testing for these endpoints is not proposed and is not considered to be justified on scientific grounds. The viscosity of tributyl phosphate is reported to be 38.6s at 29.4oC (Saybolt Viscosity).