Registration Dossier

Environmental fate & pathways

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Additional information

2,4,6,8 -tetramethylcyclotetrasiloxane hydrolyses rapidly. The half-life for the initial ring-opening has been determined to be 2.2. min at pH 7 and 22.5oC. This gives a half-life of ca. 0.085 h at pH 7 and 12oC using the conversion DT50 (XoC) = DT50 (t) x e(0.08(T-X))(ECHA Guidance R16). The rate is then ln2 / 0.085 = 8.2 h-1.