Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The composition of the registration substance has been updated (September 2020) from multiconstituent to UVCB. The change in composition means that changes to the chemical safety assessment are required. These changes are in progress but not included in the current dossier update.

The substance as currently assessed is a multi-constituent substance containing four constituents. All the constituents of the substance hydrolyse rapidly forming the corresponding silanol hydrolysis product and methanol with hydrolysis half-lives of less than 12 hours. Therefore, the environmental hazard assessment, including sediment and soil compartments due to water and moisture being present, is based on the properties of the silanol hydrolysis products in accordance with REACH guidance for Chemical Safety Assessment (Chapter R.16).

Methylsilanetriol (HP1), (3-aminopropyl)silanetriol (HP2) and 5-oxa-9-aza-1,13-disilatridecane-1,1,1,7,13,13,13-heptol (HP3) are the final products of hydrolysis reactions under conditions of a hydrolysis laboratory study, and are 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.

Reference:

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

Additional information