Registration Dossier
Registration Dossier
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EC number: 263-158-1 | CAS number: 61790-67-8
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:
- 24 November 2015 to 6 September 2016
- 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
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- ring method
- Key result
- Remarks on result:
- not determinable
- Conclusions:
- Under the conditions of the study, the surface tension of the test material could not be reliably measured as the test substance formed a micro-dispersion rather than a true solution.
- Executive summary:
The surafce tension of the test material was investigated in a study which was performed under GLP conditions and in accordance with the standardised guideline OECD 115.
The apparatus, a White Instruments Surface Tension (torsion) Balance, employing the harmonised ring method was calibrated using double-distilled water. Following calibration, a solution of test substance was prepared in double-distilled water at 90 % saturation from one of the water solubility tests, and its surface tension measured by the harmonised ring method. If the surface tension was < 60 mN/m the material was considered surface active and the Harkins Jordan correction was applied.
The surface tension of a 90 % saturated solution of an unfiltered sample was measured (test temperature 20 °C). The initial measurement was 60.5 mN/m. Upon standing for 58 minutes the surface tension had gradually decreased to 44 mN/m. Several measurements were made from 58 minutes to 120 minutes, where the surface tension varied from 44 to 48.5 mN/m. This would suggest a micro dispersion of droplets rather than particles and provides more evidence that this was not a true solution.
Under the conditions of the study, the surface tension of the test material could not be reliably measured as the test substance formed a micro-dispersion rather than a true solution.
Reference
The surface tension of a 90 % saturated solution of an unfiltered sample was measured (test temperature 20 °C). The initial measurement was 60.5 mN/m. Upon standing for 58 minutes the surface tension had gradually decreased to 44 mN/m. Several measurements were made from 58 minutes to 120 minutes, where the surface tension varied from 44 to 48.5 mN/m. This would suggest a micro dispersion of droplets rather than particles and provides more evidence that this was not a true solution.
It was concluded that the test material had an effect on the surface tension, but could not be reliably measured.
Description of key information
Under the conditions of the study, the surface tension of the test material could not be reliably measured as the test substance formed a micro-dispersion rather than a true solution.
Key value for chemical safety assessment
Additional information
The surafce tension of the test material was investigated in a study which was performed under GLP conditions and in accordance with the standardised guideline OECD 115. The study was assigned a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al. (1997).
The apparatus, a White Instruments Surface Tension (torsion) Balance, employing the harmonised ring method was calibrated using double-distilled water. Following calibration, a solution of test substance was prepared in double-distilled water at 90 % saturation from one of the water solubility tests, and its surface tension measured by the harmonised ring method. If the surface tension was < 60 mN/m the material was considered surface active and the Harkins Jordan correction was applied.
The surface tension of a 90 % saturated solution of an unfiltered sample was measured (test temperature 20 °C). The initial measurement was 60.5 mN/m. Upon standing for 58 minutes the surface tension had gradually decreased to 44 mN/m. Several measurements were made from 58 minutes to 120 minutes, where the surface tension varied from 44 to 48.5 mN/m. This would suggest a micro dispersion of droplets rather than particles and provides more evidence that this was not a true solution.
Under the conditions of the study, the surafce tension of the test material could not be reliably measured as the test substance formed a micro-dispersion rather than a true solution.
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