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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:
12 November 2012 to 18 December 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
yes
Remarks:
A reduced ring circumference of 4 cm was used, whereas the guidelines specify 6 cm. This deviation has been considered not to have affected the integrity of the study.
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
A reduced ring circumference of 4 cm was used, whereas the guidelines specify 6 cm. This deviation has been considered not to have affected the integrity of the study.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Key result
Surface tension:
72.5 mN/m
Temp.:
20 °C
Conc.:
0.135 mg/L
Remarks on result:
other: Duplicate values for 90% saturated aqueous solutions (calculated as 90% of water solubility)

Calibration factor

Sample 1                     =                   1.001

Sample 2                     =                   1.003

Surface tension          =                   reading x calibration factor
Sample 1                   =                    72.5 mN/m
Sample 2                   =                    72.5 mN/m
Temperature   :                                20.0 ± 0.5ºC

pH of sample solution:                     Sample 1 = 4.8
                                                        Sample 2 = 4.6

Since the substances showing a surface tension greater than 60 mN/m, it was considered not to be surface active. 

Conclusions:
The surface tension of duplicate 90% saturated aqueous solutions of the substance as a 50% w.w. dispersion in pharmaceutical white oil has been determined to be 72.5 mN/m at 20.0 ± 0.5°C. The substance was considered not to be surface active.
Executive summary:

The surface tension of duplicate 90% saturated aqueous solutions of the substance as a 50% w.w. dispersion in pharmaceutical white oil has been determined to be 72.5 mN/m at 20.0 ± 0.5°C. The substance was considered not to be surface active.The surface tension of the test material was conducted in a GLP-compliant ring balance test following OECD guideline 115 (Harlan 2013). The study is considered to be reliable and relevant for use for this endpoint.

Description of key information

The surface tension of duplicate 90% saturated aqueous solutions of the substance as a 50% w.w. concentration in pharmaceutical white oil has been determined to be 72.5 mN/m at 20.0 ± 0.5°C and a 90% saturated solution (calculated as 90% of water solubility: 0.135 mg/L). The substance was considered not to be surface active.

Key value for chemical safety assessment

Surface tension:
72.5
in mN/m at 20°C and concentration in mg/L:
0.135

Additional information

The surface tension of the test material was conducted in a GLP-compliant ring balance test following OECD guideline 115 (Harlan 2013).