Registration Dossier
Registration Dossier
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EC number: 223-888-3 | CAS number: 4109-96-0
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption/desorption: Low potential for adsorption.
Key value for chemical safety assessment
Additional information
Testing is waived in accordance with Column 2 of REACH Annex IX. The substance has a low potential for adsorption.
The substance is expected to hydrolyse very rapidly to form hydrogen chloride and silanediol. With further reaction of the Si-H bonds in silanediol, monosilicic acid and hydrogen are formed. Monomeric silanediol and monosilicic acid exist only in dilute aqueous solutions and readily condense at concentrations above approximately 100 -150 mg/l as SiO2 to give a dynamic equilibrium between monomer, oligomers and insoluble amorphous polysilicic acid.
Monosilicic acid is a naturally occurring substance, which will enter the natural biogeochemical cycle for silicon; adsorption/desorption studies are not relevant.Based on their structure and predicted water solubilities, the hydrolysis products will have a high affinity for water and a low affinity for organic carbon and so a low potential for adsorption to the organic carbon. However, they may interact with the mineral content of soil. Amorphous polysilicic acid is a constituent of most soils.
In addition, adsorption testing with dichlorosilane is considered technically unfeasible because the substance is a gas at normal temperature and pressure, and is expected to react violently with water.
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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