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4-phenylbutan-2-one is a colourless to yellowish liquid with an odour characteristic of aromatic compounds. Its freezing point is -16.9 °C and its boiling point is 239.6 °C. The dynamic viscosity of the substance is 2.59 mPa · s at 23 °C. The substance has a relative density of 0.9879, a water solubility of 2850 mg/L and a log Kow of 2.0 at 25 °C. The vapour pressure is 3.9 Pa at 20 °C. The flash point of the substance at 1013 hPa is 101 °C and the auto-ignition temperature is 454 ± 5 °C at standard atmospheric pressure. 4-phenylbutan-2-one is non-explosive and non-oxidising.