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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 700-717-5 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation
Chlorosilanes hydrolyse very rapidly to silanols and hydrogen chloride. The half-life for dichloro(dimethyl) silane has been estimated as 0.3 min at pH 7 and 1.5oC. This gives a half-life of ca. 0.002 h at pH 7 and 12oC using the conversion DT50 (XoC) = DT50 (t) x e(0.08(T-X)) (ECHA Guidance R16). The rate is then ln2 / 0.002 = 300 h-1. Other chlorosilanes with measured data have half lives of ca. 0.2 min at pH 7 and 1.5oC. Their rates adjusted to ln2 / 0.0014 = 495 h-1.
Biotic degradation
No ready biodegradation tests are available for MS-Silane, its constituents or their silanol hydrolysis products. Read-across from an OECD 310 study for the related substance trimethylsilanol, and category-based considerations, indicate that MS-Silane will not biodegrade in water.
Several soil studies are available for the silanol hydrolysis product of dichloro(dimethyl) silane, which is used as weight of evidence that degradation in soil does occur but not to a significant extent. Initial rates of degradation in soil simulation tests ranged from 0.16 to 2.1% per month.
The chemical safety assessment indicates that it is not necessary to obtain further information on biodegradation via simulation tests in water or sediment.
Degradation rates of MS-Silane:
Degradation rate in water: |
Rapid hydrolysis is expected. On the basis ofread-across and category-based considerations, MS-Silane is not expected to biodegrade in water |
|
Degradation rate in sediment: |
On the basis ofread-across and category-based considerations, MS-Silane is not expected to biodegrade in sediment |
|
Degradation rate in soil: |
Initial rates of degradation for dimethyl(silane) in soil simulation tests ranged from 0.16 to 2.1% per month. |
|
Degradation rate in air: |
Reaction with water vapour, rather than photolysis, is expected to be the primary degradation process of MS-Silane constituents. Calculated half-life of dimethylsilanediol for reaction with hydroxyl radicals is 2.2 days; measured half-life is 20 days. Measured half lives for other silanols range from 2-9 days. |
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.
