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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Partition coefficient

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Administrative data

Link to relevant study record(s)

Description of key information

Log Kow (dichlorosilane): Not relevant because the substance is an inorganic gas.
Log Kow (silanediol): -1.5 at 20°C (QSAR)
Log Kow (silicic acid): -4 at 20°C (QSAR)

Key value for chemical safety assessment

Additional information

In accordance with Column 2 of REACH Annex VII, the partition coefficient study does not need to be conducted as dichlorosilane and its hydrolysis products are inorganic.

Dichlorosilane reacts rapidly with water, generating silanediol and hydrochloric acid. Silanediol reacts further to give monosilicic acid, which condenses at concentrations above approximately 100 -150 mg/l as SiO2 to give insoluble amorphous polysilicic acid.

The purpose of the log Kow study is to understand the interaction of the substance with water and octanol, which acts as a model for lipids in humans and organisms and for organic carbon in soils and sediments. On the basis of structure and supported by predictions, monosilicic acid and silanediol have a high affinity with water and low affinity for lipids and organic carbon. Log Kow values of -1.5 for silanediol and -4 for monosilicic acid were determined using a QSAR method. The method has not been validated for inorganic substances but gives an indication of very low log Kow.