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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

be 15.05 (SPARC, 2010). The calculated pKa for TMP is > 10, thus the hydroxy groups of trimethylolpropan do not dissociate under normal environmental conditions (see REACH Guidance on information requirements and chemical safety assessment, Chapter R.7.1.17).

Key value for chemical safety assessment

pKa at 20°C:

Additional information