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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Description of key information

Phosphoric acid on its purest state is an (inorganic) solid, so  viscosity is considered not to be a relevant parameter. Nevertheless as phosphoric acid is produced and handled most of the time as a liquid, available supporting data are provided. They show  viscosities of 5% to 105% aqueous solutions of Phosphoric Acid in the range of 1.1 to 600 mPa.s at 20°C.

Key value for chemical safety assessment

Additional information

Supporting data from six handbooks show increasing vicosity with increasing phosphoric acid concentrations in aqueous solutions. Viscosities range from 1.1 cP (mPa.s) at 5% Phosphoric Acid to 600 cP (mPa.s) at 105% Phosphoric Acid, at 20°C.