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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Vapour pressure

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vapour pressure
Type of information:
not specified
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
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. This is a peer reviewed handbook that has been cited by the US EPA in the EPISUITE modelling program. It is therefore accepted that this data source is reasonably reliable. US EPA. (2019). Estimation Programs Interface Suite™ for Microsoft® Windows, v 4.11 or insert version used]. United States Environmental Protection Agency, Washington, DC, USA.
Principles of method if other than guideline:
No method specified as data was obtained from handbook.
GLP compliance:
not specified
Type of method:
other: Not specified
Key result
Test no.:
25 °C
Vapour pressure:
235 mm Hg
The vapour pressure of 2,3-dimethylbutane is 235 mm Hg at 25 °C.
Executive summary:

The vapour pressure of 2,3-dimethylbutance (235 mm Hg at 25 °C) has been taken from the Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. 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.

Description of key information

The vapour pressure of 2,3 -dimethylbutane is 31.3 kPa at 25 °C, respectively.

Supporting data is available for Hydrocarbons, C6, isoalkanes, <5% n-hexane and Isohexane. Based on an analogue approach, this data is read across to 2,3-dimethylbutane.

The typical vapour pressure is 25.0 kPa for Hydrocarbons, C6, isoalkanes, <5% n-hexane at 20°C

Key value for chemical safety assessment

Vapour pressure:
31.3 kPa
at the temperature of:
25 °C

Additional information