Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint summary

Administrative data

Description of key information

Additional information

The registered compound shows a fast hydrolysis under environmental conditions. The expected half-life of the registered substance is 5.7 h at pH 7 and 20-25 °C (QSAR). Therefore, hydrolysis is a relevant pathway for the degradation of the parent compound in the environment. The resulting hydrolysis products are methanol and (2,4,4-trimethylpentyl)silanetriol. Photolysis can be expected to contribute to the overall degradation of Trimethoxy(2,4,4-trimethylpentyl)silane (CAS No. 34396-03-7) in air. Trimethoxy(2,4,4-trimethylpentyl)silane and its silanol hydrolysis product do not contain chromophores that would absorb visible or UV radiation, so direct photolysis is not likely to be significant. Indirect photolysis resulting from gas-phase reaction with photochemically-produced hydroxyl radicals may occur. The calculated photodegradation half-life based on the reaction with hydroxyl radicals is 1.8 days for the registered compound and 0.96 days for its silanol hydrolysis product. Therefore, photodegradation can contribute to the degradation of the registered substance in the environment. Because the estimated vapour pressure of the silanol hydrolysis product is low (1.2E-04 Pa at 25 °C (QSAR)), photodegradation is not a relevant pathway for degradation of the silanol hydrolysis product (2,4,4-trimethylpentyl)silanetriol.