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Description of key information

The relative density of phosphoric acid was determined in accordance with test guideline EC A.3 to be 1.840 at 38 °C, following the  pycnometer method (Holzschuh, 2010).

Key value for chemical safety assessment

Additional information

The density of phosphoric acid was determined with a glass pycnometer at 40 °C in liquid form instead at 20 °C as solid. This deviation in measurement conditions was unavoidable as phosphoric acid is hygroscopic and corrosive. Stable conditions for measurements in helium pycnometer for solids could not be achieved.

In support of the density of phosphoric acid, supporting data from 10 handbooks provide (relative) densities of the different aqueous solutions of phosphoric acid. Although not always the temperature of measurement is reported, the following relative densities can be concluded:

100% solution: 1.86 to 1.87 at 20 °C to 30 °C

85% solution: 1.69 to 1.83 at 18 °C to 25 °C

75% solution: 1.57 to 1.58 at 20 °C to 30 °C

50% solution: 1.33 to 1.34 at 20 °C to 30 °C

30% solution: 1.1794 (two values, one at 25 °C and one at unspecified temperature)

10% solution: 1.0517 (one value at 25 °C)

Value used for CSA: 1.840 at 38 °C