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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Melting point / freezing point

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Administrative data

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Description of key information

about 0-5 °C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
5 °C

Additional information

The melting/freezing point for the hydroxybenzene sulphonic acid has been measured at about -2°C. The influence of sulphuric acid and water is to lower considerably the melting point, due to sulphuric acid, which has this typical behaviour, depending on the water content. The presence of disulphonic acid, whose melting point value will be a little higher that for monosulphonic acid, is not enough to have an impact on the melting point of the multiconstituent, that will be not far from the zero degrees. The risk assessment consequence is that the substance at 25°C are in fact liquid