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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Boiling point

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Administrative data

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Description of key information

The boiling point of Phosphoric Acid was determined in accordance with test guideline EC A.2 to be 296.5 °C, following the method according to Siwoloboff (Holzschuh, 2010).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
296.5 °C

Additional information

Three supporting studies indicate a boiling point at 407°C, 260°C and 213°C without specifying the physical state of the test item. Further data provide a boiling point at 213°C (hemihydrate), 261°C (100% solution), 158°C (85% solution), 135°C (75% solution) and 108°C (50% solution).

As the available supporting data are not conclusive, the value from the recent boiling point study is used for the CSA. This boiling point was obtained at 98300 Pa, but no corrections for the pressure were made as this correction is within the error of measurement for this method.