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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties

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Description of key information

Tea tree oil is a clear liquid with a green/yellow tinge and a characteristic antiseptic odour. It boils in the range 97 – 220 °C and freezes at -22 °C. Tea tree oil has a relative density at 20 °C of 0.89 and the maximum vapour pressure has been determined to be 2100 Pa at 25 °C. Partition coefficients in the range 2510 – 314000 have been measured for the main components and its water solubility is 1420 mg/L. The surface tension of a 90% saturated solution is 51.0 mN/m and that for a 1 g/l solution is 55.0 mN/m. Tea tree oil is therefore considered to be surface active. Flash point values of 54 °C and 55 °C have been determined using the closed-cup and equilibrium methods, respectively. Tea tree oil has neither explosive nor oxidising properties. The dynamic viscosity of Tea tree oil is 2.54 mPa/s at 20°C and 1.52 mPa/s at 40°C. Kinematic viscosity is 2.86 mm2/s at 20°C and 1.71 mm2/s at 40°C. The kinematic viscosity data meet CLP criteria for classification of Tea tree oil as an aspiration hazard, Asp. Tox. 1 (H304: May be fatal if swallowed and enters airways).

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