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Physical & Chemical properties

Surface tension

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Description of key information

The surface tension of the registered substance was determined to be 68 mN/m (average of three replicates) at 21°C and a concentration of 1 g/l. At this level the substance is not considered to be surface active.

Key value for chemical safety assessment

Surface tension:
68
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension of the registered substance was determined in accordance with the OECD Guideline for Testing of Chemicals 115 using the ring method. The surface tension of the substance was determined to be 68 mN/m (average of three replicates) at 21°C and a concentration of 1g/l. At this level the substance is not considered to be surface active. In addition, an equivalent study conducted on the structurally similar substance 6-[(p-Tosyl)amino]hexanoic acid, compound with 2,2',2''-nitrilotriethanol (1:1) (Tosyl salt) gave an average surface tension of 62.3 mN/m. 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.