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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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relative density
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Handbook of reliable peer-reviewed data
Principles of method if other than guideline:
No details are available on the guideline used to determine this result.
GLP compliance:
not specified
Type of method:
other: Unknown
relative density
18 °C
A density value of 3.097 kg/L at 18 °C is reported in a handbook of reliable data which has been subject to peer-review and in which the original data sources are traceable. The result is considered to be reliable.

Description of key information

Relative densities are:

Anhydrous ca. 3.1; Nonahydrate ca. 2.1 (bulk density 3100 kg/m³); solution (40 %) ca. 1.5

Key value for chemical safety assessment

Additional information

Values are available from the literature for different hydration states. The data on bulk density comprise 3100 kg Fe2(SO4)3 nonahydrate/m³ (Weast 1977). The following table gives an overview on the remaining information.

Table: Relative densities or densities [g/cm³] of the registered category member salt forms under standard pressure (ISO 5011, i.e. 101.3 kPa)

Category member, Molecular Formula  Anhydrous form Solid hydrate form Aqueous solution
Ferric sulphate, Fe2(SO4)3 3.10 at 18 °C Nonahydrate (CAS 13520-56-4): 2.1 at ambient temperature 1.47 and 1.45 at 15.5 and 17.5 °C, respectively, ca. 40 %

  • Weast RC ed (1977). CRC Handbook of Chemistry and Physics. 58th edn (1977-1978) ISBN 0-8493-0458-X. Boca Raton, FL, U.S.A. CRC Press. 2348 p.