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Physical & Chemical properties

Flash point

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Description of key information

The flash point of 2-methylbut-1-ene is -20⁰C. This value can be used as read-across for isoamylene (2-methylbutene, CAS 26760-64-5). This endpoint in conjunction with the boiling point of 31.2⁰C (2-methylbut-1-ene) will result in a classification of Category 1, hazard statement, extremely flammable liquid and vapour or in conjunction with the boiling point of 38.6⁰C (2-methylbut-2-ene) will result in a classification of Category 2, highly flammable liquid and vapour.

Key value for chemical safety assessment

Flash point at 101 325 Pa:
253.2 K

Additional information

No information on the primary source of this data or the methods used is available. However, this information is taken from a reliable peer reviewed handbook, Lide (2008) and so can be considered reliable and suitable for use as the key study for this endpoint. Most up to date source at the time. The flash point of 2-methylbut-1-ene is -20°C. This endpoint will result in a classification of either Category 1, hazard statement, extremely flammable liquid and vapour (flash point <23°C and boiling point of ≤35°C) or Category 2, hazard statement, highly flammable liquid and vapour (flash point <23°C and boiling point >35°C) depending on the boiling point of the substance. Since isoamylene (2-methylbutene,26760-64-5) is a mixture of the two isomers, 2-methylbut-2-ene (513-35-9) and 2-methylbut-1-ene (563-46-2) and in the absence of any reliable data for isoamylene then 2-methylbut-1-ene is considered a suitable substance for read-across.