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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Dissociation constant

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Administrative data

Link to relevant study record(s)

Description of key information

Dissociation constant pKa(DMSD): ca. 11.9

Key value for chemical safety assessment

Additional information

The requirement to test the substance for dissociation constant is waived because in contact with water the substance rapidly hydrolyses. The final hydrolysis product is dimethylsilanediol. The dissociation of this substance is given in secondary literature as pKa 11.9; this is consistent with values for related substances. No pKa value is available for the intermediate hydrolysis product, L3 -diol.