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EC number: 225-805-6
CAS number: 5089-70-3
The substance, (3-chloropropyl)triethoxysilane
(CAS 5089-70-3; EC No. 225-805-6), hydrolyses to (3-chloropropyl)silanetriol
(CAS 64426-41-1) 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 35 hours at pH 7 and 25°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-chloropropyl)triethoxysilane,
and the silanol hydrolysis product, (3-chloropropyl)silanetriol; because
the hydrolysis half-life is between 12 and 48 hours.
(3-Chloropropyl)silanetriol 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
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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