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Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Tris(2-butoxyethyl)-phosphate (TBEP) is an organic substance, liquid and colourless at 20°C and 101.3 kPa with a mild odour. The substance is considered surface active, is moderately soluble in water and based on the log Kow value, has a potential for bioaccumulation. TBEP exhibits a low vapour pressure therefore if released in the environment, the substance is not expected to go to the air compartment.

With regard to physical hazards, TBEP is not a fammable liquid and explosive or oxidising properties are not anticipated.

Summary of relevant physico-chemical properties:




Colourless liquid with mild odour

Freezing point


Boiling point


Relative density

1.02 at 20°C

Vapour pressure

1.52 x 10^-5 Pa at 25°C

Log Kow


Water solubility

663.5 mg/L at 20°C

Surface tension

32.7 mN/m at 20°C


Flash point = 159°C

Auto-flammability temperature = 322°C

Non flammable liquid.

Explosive properties

Not anticipated (based on chemical structure)

Oxidising properties

Not anticipated (based on chemical structure)

Viscosity (dynamic)

12.4 mPa/s