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Experimental studies investigating the abiotic hydrolysis ofFatty acids, C18-unsatd., dimers, reaction products with fatty acids, C14-18 and C16-18-unsatd. and propylidynemethanolare not available. A study conducted with the analogue substance Fatty acids, C18-unsatd., dimers, mixed esters with oleic acid and trimethylolpropane (CAS No. 147256-33-5) determined no hydrolysis under the tested condictions ( Henkel AG & Co. KGaA, 2009). The study was conducted according to OECD 111 as a preliminary test. The initial test substance concentration was 5 g/L. According to gueideline the hydrolysis was tested at three pH values (4, 7 and 9) and at a temperature of 50°C. The hydrolysis rate was determined at five consecutive days. An average recovery rate of 99 to 101% was determined demonstrating no hydrolysis of the test substance.

The results for the source substance are supported by QSAR calculations for the main components of the target substance. The QSAR calculations for the main components conducted with HYDROWIN v2.00 resulted in half-lives of >5 years at pH 7 and >200 d at pH 8 respectively (Dr. Knoell Consult GmbH, 2015). The calculated half-lives support that hydrolysis is not relevant for the substance.