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Surface tension

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Description of key information

45.9 mN/m @ 21°C 

Key value for chemical safety assessment

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

Additional information

To determine the surface-tension of the test item. The determination was carried out using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements and a procedure based on the ISO 304 method. With the exception of the following deviation, the experintal procedure used was designed to be compatible with that specified in Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995.

  • The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (± 0.5 mN/m); this is as a result of the reduced ring dimensions.

This deviation has been considered not to have affected the integrity of the study.


The surface tension of a 90% saturated aqueous solution (7.60 x 10-3 g/l, determined by HPLC) of test item has been determined to be 45.9 mN/m at 21.0 ± 0.5°C. The test item showed a surface tension lower than 60 mN/m and is considered to be surface-active.