Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Appearance

2,3 -Dichloro-1,3 -butadiene (DCBD) is a colourless to yellowish liquid (OECD SIDS).

Melting point

The melting point of 2,3 -dichloro-1,3 -butadiene (DCBD) is reported to be -40°C (Beilstein).

Boiling point

The boiling point of 2,3 -dichloro-1,3 -butadiene (DCBD) is reported to be 98°C (CRC Handbook).

Density

The density of 2,3 -dichloro-1,3 -butadiene (DCBD) is reported to be 1.1829 g/cm3 (CRD Handbook).

Granulometry

A waiver is proposed for this data requirement as the substance is a liquid.

Vapour pressure

The vapour pressure of 2,3 -dichloro-1,3 -butadiene (DCBD) is reported to be 107.4 hPa at 20°C, 132.7 hPa at 25°C and 341.5 hPa at 50°C (Bayer 2004).

Partition coefficient

The partition coefficient (log Kow) for 2,3 -dichloro-1,3 -butadiene (DCBD) was predicted to be 3.02 by QSAR estimation based on KOWWIN (Pross 2005).

Water solubility

A waiver is proposed for this data requirement because the test substance is not stable in water. This is supported by the aqueous hydrolysis study which shows rapid hydrolysis.

The water solubility of 2,3 -dichloro-1,3 -butadiene (DCBD) is calculated to 314.4 mg/L at 25 °C (EPWIN, 2010).

Surface tension

A waiver is proposed for this data requirement as the test substance is very unstable in water.

Flash point

The flash point of 2,3 -dichloro-1,3 -butadiene (DCBD) is reported to be 16.5 °C at 1013 hPa (Currenta 2010).

Autoflammability

The autoflammability of 2,3 -dichloro-1,3 -butadiene (DCBD) is reported to be 415 °C at 1014 hPa (Currenta 2010).

Flammability

A waiver is proposed for this data requirement as the substance is a liquid.

Explosiveness

A waiver is proposed for this data requirement as the substance does not contain any chemical groups associated with explosive properties.

Oxidising properties

A waiver is proposed for this data requirement as the substance is incapable of reacting exothermically with combustible materials.

Stability in organic solvents

A waiver is proposed for this data requirement as the test substance as manufactured does not include an organic solvent and it is not formulated as an organic solution in any products.

Dissociation constant

A waiver is proposed for this data requirement as the substance does not contain any ionisable functionality.

Viscosity

The viscosity of 2,3-dichloro-1,3-butadiene is reported to be 0.898 mPa·s at 20 °C and 0.876 mPa·s at 40 °C (Currenta 2010).