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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 pKa of tar acids, methylphenol fraction is between 10.1 and 10.3 (read-across).

Key value for chemical safety assessment

Additional information

There is no experimental data of dissociation constant for this substance available.

The value of pKa is obtained by using read-across estimation based on the available data for cresol mixture (mix-cresol CAS 1319 -77 -3).