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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:
11 February - 1 March 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Specific details on test material used for the study:
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at dry and dark place between 5 - 30 degCelsius
- Stability under test conditions: stable
- Solubility and stability of the test substance in the solvent/vehicle: approx. 129 g/L in water
Key result
Surface tension:
54.24 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Conclusions:
The surface tension of a 1 g/L aqueous solution of the test item Reactive Red 45:1 was determined to be 54.24 mN/m (standard deviation +/- 0.05 mN/m) at 20 degC.
Considering that distilled water has a surface tension of 72.75 mN/m at 20 degC and the test item showed a surface tension below 60 mN/m under the conditions of this referring method, the test item should be regarded as being a surface-active material.
Executive summary:

The surface tension of a 1 g/L aqueous solution of the test item Reactive Red 45:1 was determined according to OECD Guideline No. 115 (1995) and Council Regulation (EC) No. 440/2008 Method A.5 with the OECD harmonized ring method.

The determination was carried out with a tensiometer in ten successive measurements with a standard deviation ≤0.05 mN/m at a temperature of 20 °C.

The surface tension of a 1 g/L aqueous solution of the test item Reactive Red 45:1 was determined to be: 54.24 mN/m(standard deviation ± 0.05mN/m) at 20 °C.

Considering that distilled water has a surface tension of 72.75 mN/m at 20 °C and the test item showed a surface tension below 60 mN/m under the conditions of this referring method, the test item should be regarded as being a surface-active material.

Description of key information

The surface tension of a 1 g/L aqueous solution of the test item Reactive Red 45:1 was determined to be 54.24 mN/m at 20°C.

Key value for chemical safety assessment

Surface tension:
54.24
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension of a 1 g/L aqueous solution of the test item Reactive Red 45:1 was determined to be 54.24 mN/m (standard deviation +/- 0.05 mN/m) at 20°C.

Considering that distilled water has a surface tension of 72.75 mN/m at 20°C and the test item showed a surface tension below 60 mN/m under the conditions of this referring method, the test item should be regarded as being a surface-active material.