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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 determination of the dissociation constant of melam as described in the OECD guideline 112 via a titration, spectrophotometric or conductometric method failed due to the low solubility of melam.
The pKa-values for melam were therefore obtained by quantum mechanical calculations. Most likely pKa-values of 3.9; 4.8 and 8.2 for the 3 possible positions of the triazine-nitrogens were calculated.

Key value for chemical safety assessment

pKa at 20°C:

Additional information