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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:
2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
Qualifier:
according to guideline
Guideline:
other: German standard method DIN EN 14370
Deviations:
no
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
plate method
Surface tension:
33.9 mN/m
Temp.:
20 °C
Conc.:
90 vol%
Remarks on result:
other: mean value of 4 determinations after 10 to 89 minutes
Surface tension:
67.9 mN/m
Temp.:
25 °C
Conc.:
90 vol%
Remarks on result:
other: mean value of 8 determinations after 15 to 170 minutes

- Due to the high viscosity of the substance, an accurate determination of the surface tension was not possible.

- For verification of the measured values demineralized water is also measured. With a correspondence of the measured value σ (20 °C) = 72.6 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of the test item is considered as valid.

The demineralised water after filtration was also measured: The found value is σ (20 °C) = 71.9 mN/m.

Conclusions:
The surface tension of the test item in water is 67.9 mN/m at 20 °C and 33.9 mN/m at 25 °C.
Executive summary:

The surface tension at 20 °C and 25 °C of a solution of the test substance in demineralized water with a concentration corresponding to 90 % of the saturation solubility, was determined by the plate method using a tensiometer. The following result of 67.9 mN/m at 20 °C and 33.9 mN/m at 25 °C was received. The test was conducted according to the German standard method DIN EN 14370, which is equivalent to the EU Method A.5 (Surface Tension).

For verification of the measured values demineralized water is also measured. With a correspondence of the measured value σ (20 °C) = 72.6 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of the test item is considered as valid.

Description of key information

The surface tension in water is 33.9 mN/m at 25 °C and 67.9 mN/m at 20 °C, according to EU method A.5.

Key value for chemical safety assessment

Surface tension:
67.9

Additional information

The surface tension at 20 °C and 25 °C of a solution of the substance in demineralized water with a concentration corresponding to 90 % of the saturation solubility, was determined by the plate method using a tensiometer. The following result of 67.9 mN/m at 20 °C and 33.9 mN/m at 25 °C was received. For verification of the measured values demineralized water is also measured. With a correspondence of the measured value σ (20 °C) = 72.6 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension is considered as valid.