Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 23-Nov to 25-Nov 2020
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Version / remarks:
- 27 July 1995
- GLP compliance:
- no
- Type of method:
- ring method
- Key result
- Surface tension:
- 53.7 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1.13 g/L
Reference
Results
The readings, times and temperatures for the sample solutions are shown in the following tables:
| Sample 1 | Sample 2 | ||||
Age of solution (min) | Reading (mN/m) | Temperature (°C) | Age of Solution (min) | Reading (mN/m) | Temperature (°C) |
66 | 54.0 | 19.8 | 91 | 53.5 | 20.0 |
70 | 54.0 | 19.8 | 94 | 53.0 | 20.0 |
73 | 53.5 | 19.8 | 97 | 53.5 | 20.0 |
76 | 54.0 | 19.8 | 100 | 53.5 | 20.0 |
79 | 54.0 | 19.8 | 103 | 53.5 | 20.0 |
Mean Sample 1 result: 53.9 mN/m pH of Sample 1: 4.3
Mean Sample 2 result: 53.4 mN/m pH of Sample 2: 4.2
Mean result: 53.7 mN/m
Overall temperature: 19.9± 0.5 ºC
Discussion
On removal from the 20 °C equilibration, the samples were assessed as a clear and colourless liquid with excess test item floating on the surface. After centrifugation, the samples were assessed as visually clear and colourless with no excess test item or Tyndall beam effect visible.
According to criteria stated in EC Method A.5, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active.
Conclusion
The surface tension at nominally 90 % saturated solutions of test item in water has been determined to be 53.7 mN/m at 19.9 ± 0.5 °C. The test item was considered to be surface-active.
Description of key information
53.7 mN/m at 19.9 ± 0.5 °C, 90% saturated solution (OECD 115, ring method)
Key value for chemical safety assessment
- Surface tension:
- 53.7
Additional information
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