Registration Dossier
Registration Dossier
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EC number: 206-323-5 | CAS number: 327-62-8
Endpoint summary
Administrative data
Description of key information
Potassium Propionate is a white solid at 20°C and 1013 hPa (handbook data). The melting point of Potassium Propionate was reported to be > 300 °C (Buckingham et al. 1977). The boiling point of Potassium Propionate does not need to be determined because the substance has a melting point above 300°C. The density of Potassium Propionate could not be determined without additional effort because the substance is hygroscopic and is handled as aqueous solution. The density of the aqueous solution is 1.23g/cm³ at 25°C. In accordance with column 2 of REACH Annex VII 7.14, a study on granulometry does not need to be conducted if the substance is marketed or used in a non solid or granular form: The substance is marketed as aqueous solution. The vapour pressure of Potassium Propionate was not determined, however, the vapour pressure of Propionic acid is reported to be 471 Pa at 25°C (SRC database information). Based on the ionic structure, Potassium Propionate is expected to exhibit a lower vapour pressure than the free acid, thus, the vapour pressure of Propionic acid is used as a worst case estimation. A partition coefficient of Potassium Propionate is not available.The calculated value was determined with the known QSAR model KOWWINv1.68. Potassium Propionate has a logKow of -3.23 at 25°C. For Propionic acid the logKow was reported to be 0.33 at 25°C. The calculated value is considered a reliable approximation because for potassium propionate the partition coefficient is expected to be lower than the estimated for propionic acid based on the ionic structure. The water solubility of Potassium Propionate was reported to be high (freely soluble in water, JEFCA 2006). The water solubility of Propionic acid is reported to be 1000 mg/L at 20°C (pH not reported; US EPA database). Surface tension of Potassium Propionate is not expected based on its structure. It is also not expected that Potassium Propionate exhibits explosive or oxidizing properties based on its composition. The flash point of Potassium Propionate does not need to be conducted because the substance is a solid. Based on the publication of Ferloni et al. (1975) the melting point of Potassium Propionate is 364°C and there was no indication during the determination using differential scanning calorimetry. Thus, the test substance is not highly flammable.
Additional information
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