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Particle size distribution (Granulometry)

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Description of key information

The HYDROTOPES Category comprises the following 6 substances:
STS - Sodium toluene 4-sulphonate (CAS 657-84-1, EC 211-522-5)
SXS - Sodium (xylenes and 4-ethylbenzene) sulphonate (EC 701-037-1)
NH4XS - Ammonium (xylenes and 4-ethylbenzene) sulphonate (EC 943-024-5)
SCS - Sodium p-cumenesulphonate (CAS 15763-76-5, EC 239-854-6)
KCS - Potassium p-cumenesulphonate (CAS 164524-02-1, EC 629-764-9)
NH4CS - Ammonium p-cumenesulphonate (CAS 680972-33-2, EC 811-484-5) 
In addition CaXS (Calcium Xylenesulphonate, CAS 28088-63-3, EC 248-829-9) was evaluated for complete the assessment despite it is not registered under REACH.


Three members of the category were tested for particle size determination according to ISO 133320.


STS, D50 = 68 µm (mean) +/- 0.36


SXS, D50 = 101.4 µm (mean) +/- 1.7.


SCS, D50 = 83.2 µm (mean) +/- 5.9


The other hydrotropes substances are mareketed in liquid form and the test for the determination of particle size is waived.

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