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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Phototransformation in air

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Administrative data

Link to relevant study record(s)

Description of key information

Not relevant due to low vapour pressure

Key value for chemical safety assessment

Additional information

No experimental data evaluating the potential for photodegradation of Fatty acids, C16-C18, methyl esters (CAS No. 85586-21-6) in air are available. Since the substance is a complex UVCB substance, QSAR calculations using the AOPWIN v1.92 program have been performed on representative fatty acid components, resulting in estimated half-lives (DT50 values) ranging from 17.7-20.4 hours (C18 and C16 components respectively, OH concentration: 0.5E+06 OH/cm3, 24h-day (López Parrón, 2011)). These values indicate that the substance is susceptible to undergo rapid indirect photodegradation in air. Nevertheless, this is not expected to be a relevant environmental fate process for Fatty acids, C16 -18, methyl esters. Based on its low vapour pressure value (< 0.008 Pa) this substance is not expected to be present in the atmosphere in significant amounts. As this study is not a standard information requirement according to Regulation (EC) No. 1907/2006 and there is no indication from the CSA according to Annex I on the need to investigate further the fate and behavior of the substance (Annex X requirement), no testing is considered necessary.