Registration Dossier
Registration Dossier
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EC number: 807-040-5 | CAS number: 4538-42-5
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP Guideline Study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- plate method
- Surface tension:
- 72.2 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Conclusions:
- The surface tension is 72.2 mN/m (diluted to 1 g/L in water at 20°C)
- Executive summary:
According to EU Method A. 5 the surface tension is 72.2 mN/m. A commercially available tensiometer based on the plate method has been used to measure the force which is required to withdraw a horizontally suspended plate from the surface of the test item. The surface tension was determined in a solution of 1.0003 g test item in 1 L demineralized water (approx. 1 g/L) at 20 °C. After 24 h stirring a clear measuring solution was obtained and no particles were visible. For verification of the measured values the surface tension of demineralized water was also measured. With a correspondence of the measured value σ (20 °C) = 72.5 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of PDI item is considered as valid.
Reference
Result:
| Test | Time [min] | Surface tension at 20 °C [mN/m] |
| 1st value | 10 | 72.3 |
| 2nd value | 37 | 72.2 |
| 3nd value | 65 | 72.1 |
| 4nd value | 103 | 72.2 |
| Mean value | --- | 72.2 |
For verification of the measured values the surface tension of demineralized water was also measured. With a correspondence of the measured value σ (20 °C) = 72.5 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of PDI is considered as valid.
Description of key information
The surface tension is 72.2 mN/m (diluted to 1 g/L in water at 20°C)
Key value for chemical safety assessment
- Surface tension:
- 72.2
- in mN/m at 20°C and concentration in mg/L:
- 1 000.3
Additional information
For verification of the measured values the surface tension of demineralized water was also measured. With a correspondence of the measured value σ (20 °C) = 72.5 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of the substance is considered as valid.
It should be made clear that the substance hydrolyses rapidly and thus during measurement most of the substance had been disappeared.
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