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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

pka1: 10.37
pka2: 8.9
pka3: 6.35
pka4: 0.2

Key value for chemical safety assessment

Additional information

For the substance TMT six pKa values (three dissociation steps of 1,2,5-triazine-2,4,6-trithione in the pH range above 5 and three steps of protonation of the amino groups in strong acid pH regions) were estimated using ACD/LogD Suite Program: 10.37, 8.9, 6.35, 0.2, -1.25 and -3.3. Values from literature (11.38, 8.36, 5.71) are slightly different.