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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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