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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Hydrolysis

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Administrative data

Link to relevant study record(s)

Description of key information

Key study: OECD Guideline 111. GLP study. Propyltriacetoxysiloxane rapidly hydrolyses into acetic acid and the forming silanol (trihydroxypropylsilane, which undergoes fast kinetic polycondensation reactions). The half-life time at pH 1.2, 4, 7 and 9 was determined to be < 37.5 seconds.

Key value for chemical safety assessment

Half-life for hydrolysis:
0.625 min
at the temperature of:
22 °C

Additional information

Key study: An abiotic degradation study was performed on propyltriacetoxysilane according to OECD Guideline 111 (GLP study). The half-life at pH 1.2, 4, 7 and 9 of propyltriacetoxysilane was determined to be < 37.5 seconds since the test item was completely hydrolysed at 150 seconds after the initial contact of the test item with water and four completed half life cycles could be estimated in a reaction time of 150 seconds. The stated mechanism of hydrolysis of propyltriacetoxysilane was free acetic acid as the main hydrolysis product and the fast kinetic polycondensation reaction of the forming silanols (trihydroxypropylsilane).