Registration Dossier

Administrative data

Link to relevant study record(s)

Description of key information

The lower and upper flammability limits of butenes are 1.6 - 10%. The range reported are based on the data from the members of the butene category; But-1-ene (CAS no 106 -98 -9), 2 -Butene (CAS no 107 -01 -7) and 2 -methylpropene (CAS no 115 -11 -7).

Key value for chemical safety assessment

Flammability:
extremely flammable

Additional information

The data reported is derived from the members of the butenes category and was obtained from the CRC Handbook (2008). This handbook is peer-reviewed and is considered reliable and suitable for use as a key study for this endpoint.The lower and upper explosion limits of the butenes category are 1.6 -10%.

The lower and upper explosive limits of 2-methylpropene are 1.8 - 9.6 % (CRC, 2008). The lower and upper explosion limits of 2-butene are 1.7 - 9.7 %. Based on this range, 2- butene is classified as extremely flammable (CRC, 2008). The lower and upper explosive limits of but-1-ene are 1.6-10 % (CRC, 2008).

Justification for classification or non-classification

The lower and upper explosion limits of the butenes are 1.6 - 10%.This data would result in a classification of category 1 flammable gas and the hazard statement 'extremely flammable gas'.