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Vapour pressure

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Description of key information

Vapour pressure (20°C): 0.025 Pa

Key value for chemical safety assessment

Vapour pressure:
0.025 Pa
at the temperature of:
20 °C

Additional information

In the Klimisch 2 non-GLP study from Kintrup (2012) the vapour pressure of Aspartic acid, N-(3-carboxy-1-oxo-sulfopropyl)-N-(C16-18 (even numbered), C18 unsaturated alkyl) tetrasodium salts was calculated using the melting and boiling point. An estimation procedure in accordance with the test method OECD Guideline 104 “OECD Guideline For The Testing Of Chemicals, adopted by the Council on 23 March 2006, Vapour Pressure” ANNEX Estimation Method newest version (Robert S. Boethling, Donald Mackay, Handbook of Property Estimation Methods for Chemicals, Lewis Publishers, year of publication 2000, Cap. 3 - Vapour Pressure, Grain-Watson Method, p. 53 – 65) was used. This method is applied for vapour pressures between 10^3 to 10^-7 mbar. This deviates from the older version published in OECD Guideline 104. It was used due to the differentiation between solids and liquids, which results in a more precise estimate.

Using a melting point of 208°C and a boiling point of 253°C (both values might be underestimations due to decomposition) resulted in a finding that the test item has a vapour pressure of ≤ 2.5*10-2Pa at 20 °C according to the definition in the OECD Guideline 104 (Grain-Watson estimation).

This value is considered reliable for the further risk assessment.