Registration Dossier

Environmental fate & pathways

Phototransformation in air

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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 studies investigating the indirect photolysis of Fatty acids, C18 unsaturated, trimers, hydrogenated are available. As this substance is composed of different constituents, phototransformation in air was calculated for representative structures using AOPWIN v1.92 (Kampara, 2013). Half-lives from 4.5 to 5.1 hours (24 h day; OH-concentration: 0.5E+06 OH/cm³) were obtained for the different constituents, indicating rapid degradation by indirect photolysis. However, this is not expected to be a relevant environmental fate process, since the substance is not expected to be present in the atmosphere based on the low estimated vapour pressure (0.001 Pa). As this study is not a standard information requirement in REACH and there is no indication from the CSA on the need to investigate further the fate and behaviour of the substance, no further testing is considered necessary.