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Environmental fate & pathways

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The half life for hydrolysis of e-Caprolactone (Capa monomer) in sterile aqueous solution (at a concentration of ca 1 g/L) was 15.7, 52.5 and 2.2 days at pH values of 4, 7 and 9, respectively (OECD 111). At all pH values the hydrolysis product was 6 -hydroxyhexanoic acid which was stable to any further hydrolysis.

In a study conducted to OECD 301B, the susbstance e-Caprolactone (Capa monomer) was classified as readily biodegradable at a concentration of 10 mg/L.

In accordance with REACH Annex IX column 2, simulation testing in water and/or sediment and in soil do not need to be conducted as the substance is readily biodegradable.

The logKow value of e-caprolactone (Capa monomer) is 0.32 (see Section 4.7, partition coefficient). According to Column 2 of Annex IX of the REACH regulation, no study is required if the logKow is below the trigger of 3 as the substance can be expected to have a low potential for bioaccumulation.

Based on the Log Pow value (OECD 117, 0.32), the substance can be expected to have a low potential for adsorption. According to Column 2 of Annex VIII of the REACH regulation, no study is required if the logPow is below the trigger of 3 as the substance can be expected to have a low potential for adsorption.