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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

NOEC (21 d): >= 4.6 µg/l (read-across from dodecamethylcyclohexasiloxane)

Key value for chemical safety assessment

Additional information

No data are available for the long-term toxicity of Silsesquioxanes, Phenyl to aquatic invertebrates.

However, the constituents of the registration substance have very high log Kowvalues (9.0) and long-term toxicity is unlikely to be expressed. This is supported by read-across from decamethyltetrasiloxane (L4, log Kow8.2) and dodecamethylcyclohexasiloxane (D6, log Kow9) where no effects have been reported at the limit of solubility with aquatic invertebrates. A 21-day NOEC of ≥ 4.6 μg/l was obtained for the effects of dodecamethylcyclohexasiloxane (D6) on the survival, reproduction and growth ofDaphnia magna. In a study with the read-across substance decamethyltetrasiloxane (L4), a 21-day NOEC of ≥ 4.9 μg/l was obtained based on reproduction ofDaphnia magna.The read-across data from surrogate substances having similar physico chemical properties indicate no toxicity at the limit of solubility (<6.6E-03mg/l).