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Physical & Chemical properties

Density

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Description of key information

Aluminium sulphate, as anhydrous or hydrated form, is much more dense than water.
Results between 1.61 and 2.71 are reported (grade-dependent).

Key value for chemical safety assessment

Relative density at 20C:
2.71

Additional information

Three reliable literature sources are provided for the reference substance (anhydrous form), and are considered as key data. The value of 2.71 g/cm3 was also found in numerous commonly used handbooks or databases, despite not peer reviewed. Therefore this value will be retained as key value for purpose of CSA.

One of the above key source, as well as supporting information on the 18 H2O and on analogue in an experimental report provide lower values, ranging between 1.61 and 1.79; however, it is sometimes not specified if the result relates to true or apparent (bulk) density. Moreover, different cristallisation forms may lead to a different density.