Registration Dossier
Registration Dossier
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EC number: 201-069-1 | CAS number: 77-92-9
Endpoint summary
Administrative data
Description of key information
Citric acid is a solid at standard temperature and pressure, with a melting point of 153°C at 1013 hPa. The substance does not have a boiling point due to decomposition from >175°C. It has a relative density of 1.665 at 20°C and a vapour pressure of 2.2E-6 Pa at 25°C.
The substance is not classified for flammability according to Regulation (EC) No. 1272/2008 on the basis of a burning test study conducted in accordance with a relevant test method. No measured relative self-ignition temperature is available due to the melting point being lower than 160°C. It is not explosive and not oxidising on the basis of chemical structure.
Citric acid is highly soluble in water (592 g/L at 20°C). In aqueous solution, citric acid is expected to be at least partly ionised at all relevant environmental pH, with acid dissociation constants, pKa, of 3.13, 4.76 and 6.4 at 25°C. It has a very low log Kow value of -1.6 to -4 at pH 7.
For citric acid, the fraction below 100 µm was 84.1% and the D50 of the fraction below 100 µm was at 31.99 µm.
Additional information
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