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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 223-888-3 | CAS number: 4109-96-0
Endpoint summary
Administrative data
Description of key information
Additional information
Dichlorosilane hydrolyses very rapidly to give silanediol and HCl. Further hydrolysis of the Si-H bonds in silanediol is expected to happen rapidly and produces monosilicic acid, with hydrogen as a by-product.
Monosilicic acid exists only in dilute aqueous solutions and readily condenses at concentrations above approximately 100 -150 mg/l as SiO2 to give a dynamic equilibrium between monomer, oligomers and insoluble amorphous polysilicic acid.
These hydrolysis products are inorganic substances which are ubiquitous in the environment and are expected to enter natural biogeochemical cycles.
A comparison of the total flux of dissolved silica into rivers can be compared with the input from manufacture and use of hexachlorodisilane (refer to Section 9), and indicates that the input is considered negligible in comparison with the natural flux of silica/silicic acid in the environment.
Therefore, it is not appropriate to calculate Predicted Environmental Concentrations (PECs) for the ultimate silanol hydrolysis product, monosilicic acid.
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.
