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On the basis of experimental data in the form of a biodegradability screening study (OECD 301B), Diurea 8 is not considered readily biodegradable (Harlan 2012). The limited degradation may be a result of the predicted water solubility of less than 0.01 mg/L reducing the concentration and bioavailable fraction of Diurea 8 for degradation by micro-organisms. Diurea 8 only occurs in a grease base and, in realistic use scenarios, the formulated greases are specifically designed to minimise leaching of the thickener. As such, exposure to the isolated thickener is not expected to occur and biodegradation processes in water, sediment or soil are not considered to be relevant environmental fate processes.