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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

1) The substance is not readily biodegradable. However, fast primary degradation has been observed. The identified primary degradation product is benzenepropanoic acid, 3,5-bis(1,1 - dimethylethyl)-4-hydroxy- (“metilox acid”; CAS no. 20170-32-5). The other product is assumed to be accordingly 1-octadecanol (CAS 112-92-5). The rate of primary degradation seems to vary depending on the test conditions. Metilox acid is based on the available result from an OECD 301B -test not readily biodegradable. 1-Octadecanol is assumed to be not persistent based on BIOWIN–predictions.

2) The available data indicate that Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate undergoes biodegradation in water and soil systems. The results from standard biodegradation tests are variable but indicate that the substance is inherently biodegradable. The formation of degradation products is well documented for both, aquatic screening tests and soil degradation. Therefore, the performance of more sediment- or soil testing is unlikely to gain additional knowledge. Furthermore, since the substance exhibits very low water solubility, degradation in surface water is irrelevant.