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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Partition coefficient

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Description of key information

The members of category C4, high 1,3 -butadiene (>0.1%) have partition coefficients that ranges between log Kow 2.09 to 2.31

Key value for chemical safety assessment

Additional information

Measured data was not available for the members of category C4, high 1,3 -butadiene (>0.1%).

Partition co-efficient data was calculated for members of the category [68476 -52 -8, 68477 -42 -9, 68955 -28 -2, 87741 -01 -3] using the KOWWIN programme in EPISuite V4 (2009)as the structure of the stream fits the parameters of the model. The log Kow for category C4, high 1,3 -butadiene (>0.1%)is therefore taken to range from 2.09 to 2.31. In support of this, data was read across from a peer reviewed handbook (Hansch 1995) on 2 -butene , but-1 -ene and 2 -methylpropene which have a comparable structure to the members of the category