Registration Dossier
Registration Dossier
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EC number: 223-888-3 | CAS number: 4109-96-0
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Testing is waived in accordance with Column 2 of REACH Annex IX. Direct or indirect exposure of aquatic organisms to the registered substance is very limited due to the instability of the substance in water.
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; bioaccumulation studies are not relevant.
In addition, bioaccumulation 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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