Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 700-790-3 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation rates between 0 - 0.7 % were determined in reliable studies conducted on constituents of GLS-Silane according to appropriate test protocols (OECD 310/301D), and in compliance with GLP.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
GLS-Silane is a UVCB comprised of 4 silanes and 4 hydrocarbons. Dichloro(methyl)silane is the most prevalent substance and accounts for >20-<40% w/w of GLS-Silane. Chloro(dimethyl)silane and trichlorosilane make up >10-<20% and >5 -<15% of GLS-Silane respectively. The silane constituents of GLS-Silane are not biodegradable in water and comprise about 75% of the GLS-Silane. Therefore, GLS-Silane is not predicted to be biodegradable in water. Hydrolysis is expected to be the predominant breakdown pathway for these constituents.No hydrolysis study is available for the GLS-Silane. However, a reliable study equivalent to OECD 111 is available for dichloro(dimethyl)silane. This substance is fully hydrolyzed within a few minutes at pH 4, 7 and 9 and 1.5°C. This is also the case for other chlorosilanes for which measured data are available.
Chlorosilanes in general exhibit rapid hydrolysis due to the size of the silica atom and the nature of the bond. Therefore, the environmental fate properties of the silanols will be discussed as exposure to the environment to the hydrolysis products rather than the parent substance.The environmental properties of HCL will not be discussed as it will be buffered to various extents, dependent on the buffering capacity of different compartments in the environment. The predicted environmental concentrations of HCL indicate that the buffering capacity of the environment is sufficient. At pH 7 it is found as water and the chloride ion, which do not need to be further discussed.
Tetramethylsilane comprises >10 - < 30% of the GLS-Silane and does not undergo hydrolysis. The 4 hydrocarbons (isobutane, butane, chloromethane, and 2 -methylbutane) account for the remaining 0 -16% of GLS-Silane with 2-methylbutane being the predominant hydrocarbon at >3 - <10% w/w. Isobutane, butane, and chloromethane are liquified gases.
As GLS-Silane contains consitutents that hydrolyse to non-biodegradable molecules, it is regarded as being non-biodegradable.
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.
