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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The dissociation constant of the substance is 10,6 at 20°C.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

SRC PhysProp which is a peer reviewed data base reported the dissociation constant of trimethylenediamine as result from an experimental study to be 10,6 at 20°C. REAXYS which is also a peer reviewed data base reports the dissociation constant to be 10.55 at 22 °C. In addition a QSAR estimation was done using SPARC v4.5 with the result of 10,62 and 8,64 at 20°C. All values are in the same range.

The value which originates from SRC PhysProp which is a peer reviewed data base is regarded to be reliable for trimethylenediamine