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As tert-Butylperoxy-3,5,5-trimethylhexanoat is not stable under the conditions of a Koc test and due to its low water solubility, the log Koc value of tert-Butylperoxy-3,5,5-trimethylhexanoat was calculated using EPIWIN (v. 4.00). For tert-Butylperoxy-3,5,5-trimethylhexanoat the log Koc was estimated to be 3.290 and 2.642 for Kow method and MCI method, respectively (KOCWIN v.2.00, see Annex I). The Koc was estimated to be 1950 L/kg (Kow method) and 438 L/kg (MCI method).