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Physical & Chemical properties

Endpoint summary

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Description of key information

Information on the physical and chemical properties of acetonitrile is available from widely cited handbooks, scientific publications and manufacturers.

Acetonitrile as a clear, colourless liquid with a faint odour, with a freezing point of -45.7 oC and boiling point of 81.65 oC. It has a density of 0.79 g/mL at 20 oC, and a vapour pressure of 96 hPa at 20 oC and 120 hPa at 25 oC. The octanol-water partition coefficient at a nominal temperature of 25 oC is 0.46 (log Pow = -0.34). Acetonitrile is fully miscible with water in all proportions and has a viscosity of 0.35 mPa s at 20 oC. The auto-ignition temperature of acetonitrile is 524 oC.

Surface tension is not applicable as surface activity is not a desired property of the material. A study assessing the stability of acetonitrile in solvents is not needed as the stability of the substance in solvents is not considered to be critical. A dissociation constant study is not applicable as there are no functional groups capable of dissociation.

The flash point is reported to be 12.8 oC (closed cup) and 6 oC (open cup) – as the initial boiling point is >35 °C, the substance is classified as a flammable liquid category 2. Acetonitrile is not classified under any other CLP physical hazard endpoints.

Additional information