Registration Dossier
Registration Dossier
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EC number: 943-282-9 | CAS number: -
Endpoint summary
Administrative data
Description of key information
The substance is a multi-constituent substance consisting of trimethyl(octadecyloxy)silane and octadecan-1-ol.
The major constituent, trimethyl(octadecyloxy)silane, hydrolyses to trimethylsilanol and octadecan-1-ol with a predicted hydrolysis half-life of greater than 12 hours but less than 48 hours. Therefore, the environmental hazard assessment for the aquatic compartment, including waste water treatment plant, is based on the properties of the parent substance in accordance with REACH guidance for Chemical Safety Assessment (ECHA, 2016).The environmental hazard assessment for the sediment and soil compartments will be based on the properties of trimethylsilanol and octadecan-1-ol, as the hydrolysis rate for this substance is between 12 and 48 hours. Evidence from the ready biodegradation study indicates that, under environmental conditions, the parent substance will degrade rapidly in the waste water treatment plant (WWTP). This further supports the assessment of the hydrolysis products for the sediment and soil compartments.
Trimethylsilanol is the expected final product of hydrolysis reactions under conditions of a hydrolysis laboratory study. Although trimethylsilanol is not readily biodegradable, other biotic or abiotic reactions may occur over longer time-scales in the environment.
Octadecan-1-ol is well-characterised in the public domain literature.
REFERENCE:
ECHA (2016). REACH Guidance on Information Requirements and Chemical Safety Assessment Chapter R16: Environmental Exposure Assessment Version: 3.0. February 2016
Additional information
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.
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