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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The biodegradability potential of the members of Dimerised fatty acids and sub-category 2 members is evaluated based on standard biodegradation studies. These experimental results revealed a limited biodegradability potential for the members of the sub-category 2. As summarized in the category justification, the members of the fatty acids are divided into two sub-categories on the basis of their environmental fate properties. The first sub-category covers three monomeric (by-)products of the dimerization process, which are readily biodegradable. The second sub-category covers the predominately oligomers (dimeric and trimeric products) of dimerization based on their lack of ready biodegradability and other environmental fate characteristics.

Based on the results from the screening test on biodegradation in water (OECD Guideline 301 B, Ready Biodegradability: CO2 Evolution Test), Fatty acids, C18-unsaturated, dimers, hydrogenated (CAS No. 68783-41-5) is not readily biodegradable according to OECD criteria (<10 % biodegradation within 28 days).

This result is consistent with the complete data set for the sub-category 2 members of the Dimerised Fatty Acids and its derivatives as all available study reports for biodegradation in water (screening tests) for the sub-category 2 members, i.e Fatty acids, C18-unsaturated, dimers (CAS No. 61788-89-4), Fatty acids, C18-unsaturated, dimers, hydrogenated (CAS No. 68783-41-5), Fatty acids, C18-unsatd., trimers (CAS No. 68937-90-6) and Fatty acids, C16-18 and C18-unsatd., dimerised (CAS No 71808-39-4), observed a degradation of < 10 % within 28 days for the first three substances and 29.3 % within 28 days for the last mentioned substance, respectively.