Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Appearance / physical state / colour

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Administrative data

appearance / physical state / colour
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Non-GLP, guideline not known, information from published handbook, acceptable with restrictions

Data source

Reference Type:
review article or handbook
CRC Handbook of Chemistry and Physics, 89th edition, p3-344
Lide, D.R. (ed.)
Bibliographic source:
CRC Press, Boca Raton,

Materials and methods

Principles of method if other than guideline:
The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.
GLP compliance:
not specified

Test material

Constituent 1
Reference substance name:
EC Number:
EC Name:
Cas Number:

Results and discussion

Physical state at 20°C and 1013 hPa:
Substance type:

Applicant's summary and conclusion

2-methylbut-2-ene is an organic substance that is a liquid at at 20˚C and 1013.25 hPa. This conclusions can be used as read-across for isoamylene (2-methylbutene, CAS 26760-64-5).
Executive summary:

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 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. 2-methyl-2-butene is an organic substance that is a liquid at 20˚C and 1013.25 hPa. Since isoamylene (2-methylbutene, CAS 26760-64-5) is a mixture of the two isomers, 2-methylbut-2-ene (CAS 513-35-9) and 2-methylbut-1-ene (CAS 563-46-2) and in the absence of any reliable data for isoamylene then 2-methylbut-2-ene is considered a suitable substance for read-across.