Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

CBS is not readily biodegradable with a biodegradability of 0% observed in 28 days and also not inherently biodegradable with no biodegradation observed during 35 days exposure to adatped bacterial inoculum. The described main metabolites of CBS are also not readily biodegradable and only certain level of degradation was observed for MBT, BT, BTon and MeSBT when the microorganisms used adapted under special conditions. Such processes are expected in biological treatment plant, but not in the environment.


According to the REACh Annex IX the degradation behaviour of CBS should be further investigated in a simulation study in the most relevant compartment. The registrant intends to further elucidate the biodegradation in the compartment soil, as CBS can be considered between moderately sorptive and highly or strongly (ad)sorptive based on its inherent properties logPow = 5.02 (exp. Currenta, 2010) and logKoc between 3.33 and 4.13 (calc. Currenta 2021).