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Physical & Chemical properties

Surface tension

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Description of key information

Under the conditions of the study, the surface tension of the test material was 72.1 mN/m (90 % saturated solution) at 20 °C.

Key value for chemical safety assessment

Surface tension:
72.1

Additional information

The surface tension of the test material was investigated in a study which was performed under GLP conditions and in accordance with the standardised guideline OECD 115. The study was assigned a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al. (1997).

The apparatus, a White Instruments Surface Tension (torsion) Balance, employing the harmonised ring method was calibrated using double-distilled water and the calibration factor was determined to be 0.9966. Following calibration, a solution of test substance was prepared in double-distilled water at 90 % saturation from one of the water solubility tests, and its surface tension measured by the harmonised ring method. An unfiltered sample from the last time point of the water solubility test was diluted to 90% saturation with double-distilled water. The surface tension test was performed at 20 °C and testing started 6 minutes after sample preparation. Five measurements were taken at 6, 8, 10, 12 and 14 minutes and gave a surface tension of 72.5, 72.5, 72.0, 72.0 and 72.5 mN/m respectively. The corrected mean was 72.1 mN/m. Therefore the test material was not considered surface active.

Under the conditions of the study, the surface tension of the test material was 72.1 mN/m (90 % saturated solution) at 20 °C.