Registration Dossier
Registration Dossier
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EC number: 200-913-6 | CAS number: 75-89-8
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:
- 2010-06-08 to 2010-07-28
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- The study was conducted according to internationally recognised guidelines, and under GLP. No deviation affected the quality of the study.
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Qualifier:
- according to guideline
- Guideline:
- other: DIN EN 14370
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- OECD harmonised ring method
- Key result
- Surface tension:
- 69.3 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Conclusions:
- The substance has no surface activity under the test conditions.
- Executive summary:
The study was conducted according to the guidelines into force (ring method), and under GLP. The surface tension of the substance TFE was measured to be 69.3 (+/- 0.1) mN/m at the maximum testing concentration of 1 g/L, and at the temperature of 20°C.
Reference
Table 1. Measured Surface Tension of Water
| Replicate No. | Time expired* [min] | Temperature [°C] | Surface tension of Water | ||
| measured [mN/m] | |||||
| 1 | 0 | 20,4 | 72,0 | ||
| 2 | 15 | 20,4 | 72,2 | ||
| 3 | 30 | 20,3 | 72,2 | ||
| 4 | 45 | 20,3 | 72,3 | ||
| 5 | 60 | 20,3 | 72,4 | ||
| 6 | 75 | 20,3 | 72,4 | ||
| mean value (n=6): | 72,3 | ||||
| SD (n=6): | 0,2 | ||||
Literature value for surface tension of water: 72.8 mN/m
Correction factor = 72.8 / 72.3 1.007
* time expired since the pure water was transfered into the test vessel
Table 2. Measured Surface Tension of an Aqueous Solution of the Test Item
| Replicate No. | Time expired* [min] | Temperature [°C] | Surface tension of Water | ||
| measured [mN/m] | corrected1 [mN/] | corrected2 [mN/] | |||
| 1 | 0 | 20,0 | 70,9 | ||
| 2 | 15 | 20,0 | 69,9 | ||
| 3 | 30 | 20,1 | 69,1 | ||
| 4 | 45 | 20,1 | 68,9 | ||
| 5 | 60 | 20,2 | 68,9 | ||
| 6 | 75 | 20,2 | 68,9 | ||
| mean value (n=4): | 69,0 | 69,5 | 69,3 | ||
| SD (n=4): | 0,10 | ||||
* time expired since the test item solution was transfered into the test vessel
1corrected for the calibration factor (water) = 1.007
2corrected by Harkins-Jordan regression (y = 0.7232 * x1.0756 )
Rounded values of the constant readings (+/- 0.2 mN/m) were used for the correction
Description of key information
The substance TFE is not considered to be a surface-active agent, according to EC criteria.
Key value for chemical safety assessment
- Surface tension:
- 69.3
- in mN/m at 20°C and concentration in mg/L:
- 1 000
Additional information
A fully reliable GLP study was conducted at the maximum testing concentration of 1 g/L, showing only a slight lowering of the surface tension of water.
Two supporting published studies show significant surface active properties for TFE, but applying to higher concentrations than required for testing.
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