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The substance Y-15099 (CAS 220727-26-4) is hydrolytically unstable with a DT50 of 45.5 h at pH 7, 0.0628 h at pH 4 and 4.46 h at pH 9 (Tarran and White, 2012). Corresponding hydrolysis products were not measured in this study but can be deducted from the chemical structure. Octanoic acid, silanetriol, (3-mercaptopropyl)- and ethanol were identified as hydrolysis products of Y-15099.

Phototransformation in air is not considered to be a relevant degradation pathway since evaporation into air is negligible based on the calculated Henry’s Law Constant of < 1 Pa m³/mole for Y-15099 and its hydrolysis products (Müller, 2012). The hydrolysis product ethanol, which is expected to participate mainly to the atmospheric compartment is well characterized and the expected half-life was estimated to be 10 - 36 h. It's photochemical ozone creation potential is considered to be moderate to low (OECD, 2004).

References: OECD (2004): Ethanol. SIDS Initial Assessment Report For SIAM 19, Berlin, Germany, 19 - 22 October 2004. UNEP publications.