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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The substance, 3-(triethoxysilyl)propanethiol (CAS 14814-09-6; EC No. 238-883-1), hydrolyses to 3-(trihydroxysilyl)propanethiol and ethanol (CAS 64-17-5; EC No. 200-578-6), with a hydrolysis half-life of greater than 12 hours but less than 48 hours (half-life 32.1 hours at pH 7 and 20°C). Therefore, the environmental hazard assessment for the aquatic compartment, including wastewater treatment plant, is based on the properties of the parent substance in accordance with REACH guidance for Chemical Safety Assessment (Chapter R16). The environmental hazard assessment for soil and sediment is considered for both the parent substance, 3-(triethoxysilyl)propanethiol, and the silanol hydrolysis product, 3-(trihydroxysilyl)propanethiol; because the hydrolysis half-life is between 12 and 48 hours.


3-(Trihydroxysilyl)propanethiol is the final product of hydrolysis reactions under conditions of a hydrolysis laboratory study and is the hydrolysis product relevant to conventional REACH Chemical Safety Assessment. However, other biotic or abiotic reactions may occur over longer time-scales in the environment.



ECHA (2016). REACH Guidance on Information Requirements and Chemical Safety Assessment Chapter R16: Environmental Exposure Assessment Version: 3.0. February 2016

Additional information