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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

None of the tested esters of the category were readily biodegradable within the 10-day window. However, a slight trend was observed which most likely can be attributed to the degree of branched fatty acids contained in a substance: the higher the percentage of branched fatty acids, the less biodegradable a substance is. Based on experiences of the UK Competent Authority, substances with a percentage of more than 25% branched components were classified as dangerous to the environment and labelled as R53 whereas the remaining substances are currently not classified with R53 phrase. HXL-8366 contains < 25% branched fatty acids and is therefore not classified.

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Additional information

None of the tested esters were readily biodegradable within the 10 -day window. However, a slight trend was observed which most likely can be attributed to the degree of branched fatty acids contained in a substance: the higher the percentage of branched fatty acids, the less biodegradable a substance is. Based on experiences of the UK Competent Authority, which already had dealt with this concept for other groups of linear and branched substances, substances with a percentage of more than 25% branched components were classified as dangerous to the environment and labelled as R53 whereas the remaining substances are currently not classified with R53 phrase. Since HXL-8366 contains < 25% branched fatty acids, this substance is considered not readily biodegradable.