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Description of key information

Flammability data was read across from substances wiith compatable structure to those in (category C4, high 1,3 -butadiene (>0.1%).But-1-ene (CAS no 106 -98 -9)  2 -methylpropene (CAS no 115 -11 -7) and 1,3 butadiene. The lower and upper explosion limits ranged from 1.6-12%

Key value for chemical safety assessment

extremely flammable

Additional information

Measured data on the flammability of the members of category C4, high 1,3 -butadiene (>0.1%).

was not available. Therefore read across from handbook data (CRC 2008) from comparable substances [2 -methylpropene, 1,3 -butadiene, but-1 -ene] was deemed appropriate as they have a similar structure to the category members and so phys-chem properties are predicted to be similar. No information on the method used was reported in the handbook. However, this information is taken from the CRC handbook (2008) which is a reliable peer reviewed handbook and so can be considered reliable and suitable for use as the key study for this endpoint.The lower and upper explosion limits of butenes are 1.6 - 12 %.

Justification for classification or non-classification

The lower and upper explosion limits are are 1.6 - 12%.This data would result in a classification of category 1 flammable gas and the hazard statement 'extremely flammable gas'.