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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
31 January 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
70.6 mN/m
Temp.:
20 °C
Remarks on result:
other: concentration not specified

The surface tension of the water soluble components from the test material in aqueous solution read on the instrument was 69.9 mN/m at 20°C ± 0.5°C using the ring method representing the mean of five 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 70.6 mN/m.

As the surface tension value was higher than 60 mN/m, the test material is considered to be a non-surface active substance.

The solution was used within about 3 hours between preparation and measurement of the solution.

Measured Surface Tension Values and Equilibrium Times

Surface tension (mN/m)

Additional time after about 5 minutes

(sec)*

69.92

44

69.94

73

69.94

102

69.94

130

69.94

159

 *The device has a few seconds of deadtime, which are not presented in the Table.

Conclusions:
Under the conditions of the study the test material had a surface tension value of 70.6 mN/m at 20°C ± 0.5°C and is therefore considered to be a non-surface active substance.
Executive summary:

The surface tension of the test material was assessed in accordance with the standardised test methods OECD 115 and EU Method A.5 in accordance with GLP by the ring method.

Although the test material (a highly coloured hydrophobic substance) has a low water solubility, it had been found to release water soluble impurities in water; hence it was considered appropriate to perform this study.

Under the conditions of the study the test material had a surface tension value of 70.6 mN/m at 20 °C ± 0.5 °C and is therefore considered to be a non-surface active substance.

Description of key information

Under the conditions of the study the test material had a tension value of 70.6 mN/m at 20°C ± 0.5°C and is therefore considered to be a non-surface active substance.

Key value for chemical safety assessment

Surface tension:
70.6

Additional information

The surface tension of the test material was assessed in accordance with the standardised test methods OECD 115 and EU Method A.5 in accordance with GLP by the ring method. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

Although the test material (a highly coloured hydrophobic substance) has a low water solubility, it had been found to release water soluble impurities in water; hence it was considered appropriate to perform this study.

Under the conditions of the study the test material had a tension value of 70.6 mN/m at 20 °C ± 0.5 °C and is therefore considered to be a non-surface active substance.