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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

FeClSO4: Anhydrous form not stable; Aqueous solution (40 %) ca. -50 °C

Key value for chemical safety assessment

Additional information


It should be noted that all the soluble iron salt category members decompose at elevated temperatures to give toxic gases. This is sometimes noticed as “sublimation”.

Ferric chloride sulphate, FeClSO4

This endpoint has been waived as measurement of the dry salt is technically not feasible. The compound is marketed as aqueous solution for which the melting point is known to be approximately -50 °C.

Table: Melting point under standard pressure (ISO 5011, i.e. 101.3 kPa)

Category member, Molecular Formula  Anhydrous form Solid hydrate form Aqueous solution
Ferric chloride sulphate, FeClSO4 -50 °C