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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Vapour pressure

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Description of key information

No vapour pressure data were available for any of the streams in this Category. However, data were read across from the main hydrocarbon C4 constituents in this Category. The representative constituents of the category studied and used as supporting read-across are But-1-en-3-yne (CAS 689-97-4), But-1-ene (CAS 106-98-9), But-2-ene, cis- (CAS 590-18-1), But-2-ene, trans- (CAS 624-64-6), Buta-1,2-diene (CAS 590-19-2), Buta-1,3-diene (CAS 106-99-0), Butane (CAS 106-97-8), Prop-1-ene, 2-methyl- (CAS 115-11-7), Propane, 2-methyl- (CAS 75-28-5).


The vapour pressure was determined at 20-25 °C, some of which are extrapolation from results at lower temperatures. No information on the methods used is available but this information is taken from a reliable, peer-reviewed handbooks and is considered reliable and suitable for use for this endpoint.


The vapour pressures of the representative constituents of this Category were found to range from 168 kPa to 1750 kPa.

Key value for chemical safety assessment

Additional information