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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Administrative data

Link to relevant study record(s)

bioaccumulation in aquatic species: fish
Data waiving:
other justification
Justification for data waiving:

Description of key information

Bioaccumulation: aquatic/sediment: Low potential for bioaccumulation.

Key value for chemical safety assessment

Additional information

The parent compound trimethoxy(2,4,4-trimethylpentyl)silane (CAS 34396-03-7) has an estimated log Kow of 4.0 and a calculated log Koa < 5.0. However, the parent compound is expected to hydrolyse rapidly in the aquatic environment (DT50 = 5.7 h at pH 7 and 20 – 25 °C, QSAR). Its hydrolysis products (2,4,4-trimethylpentyl)silanetriol and methanol have predicted low log Kow values of 0.9 and -0.82 to -0.64, respectively. Thus, the hydrolysis products have a low potential for bioaccumulation. Therefore, in accordance with Column 2 of REACH Annex IX, bioaccumulation in aquatic species does not need to be assessed.