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EC number: - | CAS number: -
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
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- Surface tension
- Flash point
- Auto flammability
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- Viscosity
- Additional physico-chemical information
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- Nanomaterial crystalline phase
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- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
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- Endpoint summary
- Stability
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- Ecotoxicological Summary
- Aquatic toxicity
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- Additional toxicological data

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:
- 2019
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Remarks:
- As the test substance is a surfactant, the surface tension was used to determine the water solubility rather than the standard solubility.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The method used in this study to determine the Critical Micelle Concentration, is a drop tensiometer. The surface tension is determined by the software for various concentrations. The surfactant concentration after each measurement is automatically increased and the measurement procedure is repeated. Below the critical micelle concentration, the surface tension decreases when the concentration of surfactant increases. Once the CMC has been reached or exceeded, the surface tension remains constant. The critical micelle concentration is determine graphically by the slope change of the surface tension curve.
- GLP compliance:
- no
- Type of method:
- other: drop tensiometer
- Surface tension:
- 30.4 mN/m
- Temp.:
- 21 °C
- Conc.:
- 0.036 g/L
- Remarks on result:
- other:
- Remarks:
- ST at CMC
- Executive summary:
As the test substance is a surfactant, the CMC was determined rather than the standard solubility.
The drop tensiometer was used to measure the surface tension for different solution concentrations.
The Surface Tension was measured as 30.4 mN/m at the CMC of 0.036 g/L (36 mg/L).
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- march 2009
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- According to the standard method and it is not GLP; test item concentration differs
- Qualifier:
- according to guideline
- Guideline:
- other: EN14370 (2004)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- ring method
- Surface tension:
- 31.5 mN/m
- Temp.:
- 23 °C
- Conc.:
- 0.9 mg/L
- Conclusions:
- The test item is surface-active in the test conditions.
- Executive summary:
The static surface tension measurements on 2 samples with surface active agents LF 324 and LF 345 were performed according the Ring-method according EN 14370 (2004).
The surface tension of test item was measured as 31.5 mN/m at 23°C. (concentration 0.9 mg/L)
Referenceopen allclose all
Surface tension of water before measurement = 71.7 mN/m
Critical Micelle Concentration = 0.036 g/L
Surface tension at CMC = 30.4 mN/m
Increasement of surface tension after 1g/ L correspond to non solubility observed during preparation of solutions of concentration over 1g/ L. This behavior doesn’t impact the determination of the CMC of the sample.
CMC values according Ring-method EN 14370 (T=23.0ºC ± 0.5ºC)
sample | CMC (mg/L) |
Solution 1 -measurement 1 | 0.953 |
Solution 1 -measurement 2 | 0.841 |
Solution 2 -measurement 1 | 2.100 |
Solution 2 -measurement 2 | 2.271 |
Description of key information
The test item is surface-active in the test conditions.
Key value for chemical safety assessment
- Surface tension:
- 30.4
- in mN/m at 20°C and concentration in mg/L:
- 36
Additional information
An experimental study (Processium 2019) was conducted on the substance to determine the CMC, using the drop tensiometer method. Despite the procedure does not follow the standard guideline, it was considered relevant for a surfactant, and reliable. The surface tension at CMC was retained as the key value.
A supporting study (Kruss 2004) was performed according to EN 14370 (2004), ring-method; test item ID is unclear (same constituents but different concentration than the registered substance, according to sponsor), but the result confirms the surface-active properties, with a similar value of 31.5 mN/m at CMC.
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