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Environmental fate & pathways

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The results of the QSAR predictions (Howard et al. 1992, 2005) for the butenes category (but-1-ene (CAS 106-98-9), 2 -butene (CAS 107-01-7) and 2-methylpropene (CAS 115-11-7)) indicate that they are expected to degrade rapidly, with an estimated half life of 2 days to 2.8 days. These results indicate that they would not meet the criteria for persistent in the PBT assessment and do not indicate the potential for long term effects in the environment for the classification and labelling assessment.