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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Administrative data

Link to relevant study record(s)

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'.