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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption / desorption: log Koc 4.1 (QSAR).

Key value for chemical safety assessment

Koc at 20 °C:
12 589

Additional information

A log Koc value of 4.1 at 20 - 25°C was obtained using a validated QSAR method. The result is considered to be reliable. The registration substance has an average purity of >80% Vi4-D4, with <15% 2,4,6,8,10-pentamethyl-2,4,6,8,10-pentavinylcyclopentasiloxane (Vi5-D5; CAS 17704-22-2; Impurity 1) and <10%2,4,6-trimethyl-2,4,6-trivinylcyclotrisiloxane (Vi3-D3; CAS 3901-77-7; Impurity 2) present as impurities.

A log Kocvalue of 6.0 at 20 - 25°C was obtained for Vi5-D5 using a validated QSAR method. The result is considered to be reliable.

Adsorption data are not relevant for Vi3-D3, as it hydrolyses rapidly; a data waiver is applicable.

[LogKoc: 4.1]