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Description of key information

Key value for chemical safety assessment

Additional information

Sediment organism toxicity studies have not been conducted for tri(isopropyl)silyl acrylate. However, they are not required for Annex IX substances under the REACH Regulation. The registered substance hydrolyses very rapidly to tris(1-methylethyl)silanol and acrylic acid.

Tris(1-methylethyl)silanol has a log Kow value of 3.9. Therefore, the need for further testing is assessed by deriving a PNEC from the Equilibrium Partitioning method (EqP) and deriving a risk characterisation by deriving a PEC/PNEC ratio (see Section 10).

Acrylic acid has a log Kow value of 0.46 at 25°C for the molecular form and -2.3 for the ionised form present at pH 7, and therefore further consideration of the sediment compartment is not required.