Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Information on the physical and chemical properties of acetonitrile, which as a whole can be considered reliable, is available from widely cited handbooks and manufacturers.

Physico-Chemical Properties of Acetonitrile

PROPERTY

VALUE

REMARKS

Physical state (at ntp)

Liquid

Colourless with a faint odour.

Melting point, deg C

- 45.7

 

Boiling point, deg C

81.6

@ 1013.25 hPa

Relative density (d420)

0.79

@ 20 deg C 

Vapour pressure hPa

98.64

121.44

@ 20 deg C

@25 deg C

Partition coefficient Log n-octanol/water

- 0.54

@ 25 deg C

Water solubility (at 25 deg C) mg/L

1000000

 

Surface tension dynes/cm

29.04

@ 20 deg C

Flash point, deg C

5 - 6

12.8

(open cup)

(closed cup)

Autoflammability, deg C

524

 

Flammability % in volume

3.0

16

Lower flammability limit (LFL)

Upper flammability limit (UFL)

Oxidising properties

 

Not applicable; waiver requested 

Stability in organic solvents / degradation

 

 Stable in organic solvents;

Releases hydrogen cyanide when heated to decomposition or when reacted with acids or oxidising agents.

Dissociation constant pKa

~30

Estimated

Viscosity cP

0.35

@ 20 deg C

Conversion factor mg/m3

1.68

@ 25 deg C

Relative vapour density (air=1)

1.42

 

Refractive index

1.34604

1.33934

@ 15 deg C

@ 30 deg C