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1,8-Diazabicyclo(5,4,0)undecen-7 (DBU) CAS 6674-22-2, is a colourless to yellowish liquid with an unpleasant odour. 1,8-Diazabicyclo(5,4,0)undecen-7 has no melting point and no decomposition between of -100 °C and 30 °C. A glass transition was reported at -90°C and a boiling point of 259.8 °C at 1013 hPa was reported. 1,8-Diazabicyclo(5,4,0)undecen-7 has a density of 1.0190 g/cm3at 20 °C and a calculated vapour pressure of 0.03 hPa at 25 °C. 1,8-Diazabicyclo(5,4,0)undecen-7 has partition coefficient of log Pow < -2.2 25 °C at neural pH and a water solubility of 4917 mg/L at 25 °C. 1,8-Diazabicyclo(5,4,0)undecen-7 has a flash point of 111 °C at 1013.25 hPa with a self-ignition temperature of 266 °C.

The substance has no pyrophoric properties and is non flammable. It is non explosive and possesses no oxidising properties. 1,8-Diazabicyclo(5,4,0)undecen-7 dissociation constant was reported to be 11.6 at 20 °C. 1,8-Diazabicyclo(5,4,0)undecen-7 has a viscosity of 10.1 mm2/s at 20 °C.