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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Styrene is a colourless liquid substance. The physico-chemical properties of styrene are summarized in table below.

Table . Overview of physico-chemical properties





Physical state at 20°C and 101.3 kPa

Colourless liquid substance


Melting / freezing point


Experimental, handbook data


QSAR estimated data

Boiling point:


Experimental, handbook data


QSAR estimated data

Relative density:

 0.9 g/cm3(at 20oC)


Vapour pressure:

6.4 mm Hg (at 25oC)

Experimental, handbook data

5.05 mm Hg; 0.674 kPa (at 25oC)

QSAR Estimated values

Water solubility:

310mg/L(at 25oC)

Experimental, handbook data

160 mg/L to 344 mg/L (at 25oC)

QSAR Estimated values

Partition coefficient n-octanol/water (log value):

log Pow/log Kow: 2.95 -3.00


Experimental, handbook data

log Pow/log Kow: 2.90


QSAR Estimated values

Flash point:

31oC to 34.4oC (closed cup)

36.7oC (open cup)

Experimental, handbook data


Flammable liquid


Explosive properties:

Not Explosive


Oxidising properties:

Not oxidizing



Not applicable

Liquid substance