Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Stability in organic solvents and identity of relevant degradation products

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Administrative data

Link to relevant study record(s)

Description of key information

The ASA Category comprises 5 aromatic sulphonic acids:


TSA, Toluene-4-sulphonic acid (EC 203-180-0, CAS 104-15-4)


XSA, (Xylenes and 4-ethylbenzene) sulphonic acid (EC 701-247-3, CAS -) Former EC 246-839-8:


CSA, p-cumene sulphonic acid (EC 240-210-1, CAS 16066-35-6)


BSA, Benzene sulphonic acid (EC 202-638-7, CAS 98-11-3)


HBSA, 4-hydroxybenzensulphonic acid (EC No. 202-691-6, CAS No. 98-67-9)


The study is not required because the stability of the substance is not considered to be critical (Annex IX of REACH regulation point 7.15 column 1) based on the chemical structure.

Additional information