Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Environmental fate & pathways

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. At concentrations above about 100-150 mg/l (measured as SiO2equivalents), condensation products of monosilicic acid can also form. At concentrations >100-150 mg/l of SiO2,monomeric monosilicic acid condenses into colloidal particles of polysilicic acid (silica sol) or a highly cross-linked network (silica gel).

These hydrolysis products are inorganic substances which enter natural biogeochemical cycles. It is not appropriate to calculate Predicted Environmental Concentrations (PECs) for monosilicic acid. Refer to Section 9.0.