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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Administrative data

Link to relevant study record(s)

Description of key information

The ASA Category comprises the following 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)

Aromatic sulphonic acids are non-flammable as determined for 5 of the acids, including liquid and solid forms as per available tests' results.

EU Method A10, flammable solids for TSA

EU Method A12, (Flammability (Contact with Water)) for all the substances (TSA, BSA, HBSA, XSA and CSA)

EU Method A13 Pyrophoric Properties of Solids and Liquids) for all the substances (TSA, BSA, HBSA, XSA and CSA).

No flammability or reaction with water or ignition in contact with air were observed.

Key value for chemical safety assessment

non flammable

Additional information

Justification for classification or non-classification