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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21 September 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Key result
Surface tension:
32.5 mN/m
Temp.:
21 °C
Conc.:
0.978 g/L

- The surface tension of the test material aqueous solution read on the instrument was 32.0 mN/m at 21 ± 0.5 °C using the ring method representing the mean of five separate measurements. The measured values were corrected with Harkins-Jordan correction factor.

- The measured surface tension was multiplied by Φb resulting in a corrected surface tension of 32.5 mN/m.

- As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.

Table 1: Measured surface tension values and equilibrium times

Surface tension (mN/m)

Time (sec)

32.14

334

32.06

358

32.01

382

31.98

405

31.94

429

Conclusions:
Under the conditions of this study, the surface tension of the test material was 32.5 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.
Executive summary:

The surface tension of the test material was investigated in accordance with the standardised guidelines OECD 115 and EU Method A.5, under GLP conditions with a tensiometer using the ring method.

The surface tension of the test material aqueous solution read on the instrument was 32.0 mN/m at 21 ± 0.5 °C using the ring method representing the mean of five separate measurements. The measured values were corrected with Harkins-Jordan correction factor. The measured surface tension was multiplied by Φb resulting in a corrected surface tension of 32.5 mN/m.

Under the conditions of this study, the surface tension of the test material was 32.5 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.

Description of key information

Under the conditions of this study, the surface tension of the test material was 32.5 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.

Key value for chemical safety assessment

Surface tension:
32.5
in mN/m at 20°C and concentration in mg/L:
978

Additional information

The surface tension of the test material was investigated in accordance with the standardised guidelines OECD 115 and EU Method A.5, under GLP conditions with a tensiometer using the ring method.

The surface tension of the test material aqueous solution read on the instrument was 32.0 mN/m at 21 ± 0.5 °C using the ring method representing the mean of five separate measurements. The measured values were corrected with Harkins-Jordan correction factor. The measured surface tension was multiplied by Φb resulting in a corrected surface tension of 32.5 mN/m.

Under the conditions of this study, the surface tension of the test material was 32.5 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.