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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Benzyltrimethylammonium chloride (BTMAC DRY) is a quaternary ammonium salt which completely dissociates in water. The dissociation of the salt is not an equilibrium and therefore the dissociation constant of the test substance could not be determined.

Key value for chemical safety assessment

Additional information

7.16. Dissociation constant

The study does not need to be conducted if:

— the substance is hydrolytically unstable (half-life less than 12 hours) or is readily oxidisable in water,


— it is scientifically not possible to perform the test for instance if the analytical method is not sensitive