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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties


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Description of key information

The densities of the butenes category members were reported to range from 0.588 to 0.616 g/cm3. This range was derived from the members of the butenes category: but-1-ene (CAS 106-98-9), 2-butene (CAS 107-01-7) and 2-methylpropene (CAS 115-11-7).

Key value for chemical safety assessment

Relative density at 20C:

Additional information

The data reported are derived from the members of the butenes category and were obtained from the CRC Handbook (Lide 2008). This handbook is peer-reviewed and is considered reliable and suitable for use as a key study for this endpoint. The density of the butenes category therefore ranges from 0.588 to 0.616 g/cm3. The data are supported by results from the Merck Handbook (O’Neil 2006), which is a peer reviewed handbook with results of 0.6255 at -6.47°C for but-1-ene and 0.5942 at 20°C for 2-methylpropene.

The density of 2-methylpropene is 0.59 g/cm3 (Lide 2008). The density of 2-butene ranges from 0.599 to 0.616 g/cm³ (Lide 2008). The density of but-1-ene is 0.588 g/cm3 (Lide 2008). The mean of the density values for the butenes is 0.598 g/cm3and this has been used to complete the 'key value for chemical safety assessment'.