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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The vapour pressure of 2-methylbut-2-ene is 621.5 hPa at 25°C.

Key value for chemical safety assessment

Vapour pressure:
621.5 hPa
at the temperature of:
25 °C

Additional information

No information on the primary source of the data or the methods used is available. However, this information is taken from a reliable peer reviewed handbook, Zwolinski et. al (1971), and so can be considered reliable and suitable for use as the key study for this endpoint. The vapour pressure of 2-methylbut-2-ene is 621.5 hPa at 25°C. The result is supported by data from the CRC Handbook (Lide 2008), which determined the vapour pressure to be 10 kPa at -15.8°C.