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Physical & Chemical properties

Melting point / freezing point

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Description of key information

FeCl3: Anhydrous form 306 ºC; Hexahydrate 37 ºC; Aqueous solution (40 %) -12 to -13 ºC

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, FeCl3

The melting point of the anhydrous salt is high, with much evidence for true melting without decomposition above 300 ºC. The hydrated forms have much lower melting points and the aqueous solution melts below 0 ºC. Some sources have referred to the “sublimation” of ferric chloride and/or evolution of chlorine due to decomposition. For anhydrous ferric chloride the decomposition temperature is lower than that observed for some other iron salts, but decomposition is not complete. Ferric chloride does not decompose in such a way as to present a chlorine release hazard.

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

Category member, Molecular Formula  Anhydrous form Solid hydrate form Aqueous solution
Ferric chloride, FeCl3 306 °C Hexahydrate CAS 10025-77-1: 37 °C -12 °C