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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure of the substance was estimated using the MacKay equation technique in the MPBPWIN model, which is part of the EpiSuite modelling package, and was estimated to be 2.24 x 10^-15 Pa at 25°C

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure of the substance was estimated using the MacKay equation technique in the MPBPWIN model, which is part of the EpiSuite modelling package, and was estimated to be 2.24 x 10-15 Pa at 25°C. In addition, an equivalent assessment was conducted on the structurally similar substance 6-[(p-Tosyl)amino]hexanoic acid, compound with 2,2’,2’’- nitrilotriethanol (1:1) (Tosyl salt). The vapour pressure of the read-across substance was found to be 6.27 x 10-14 Pa at 25°C. Read-across between the registered substance and the test substance (Tosyl salt) is considered justified owing to the structural similarity of the two substances. Both are salts of a carboxylic acid and triethanolamine. The acid components are structural isomers and differ only in the position of a single methyl group in the N-methyl salt. This is not expected to change the behavior or properties of the substances, and both substances have shown similarity in the results of other physical endpoints such as water solubility.