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EC number: 620-174-7 | CAS number: 1079184-43-2
- 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
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- 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:
- 25.09.2008 to 09.03.2009
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- the test system, however, proved to be unsuitable for this kind of substance
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Version / remarks:
- (1995)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Version / remarks:
- (2008)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- OECD harmonised ring method
- Surface tension:
- 68.3 mN/m
- Temp.:
- 20 °C
- Conc.:
- 15.2 mg/L
- Surface tension:
- < 40 mN/m
- Temp.:
- 20 °C
- Conc.:
- 15.2 mg/L
- Conclusions:
- The surface tension of MDEA-Esterquat C16-18 and C18 unsatd. was investigated in a study conducted according to OECD Guideline 115 (Surface Tension of Aqueous Solutions; 1995) and EU Method A.5 (Surface Tension; 2008). A mean surface tension (5 -9 measurements) of 68.3 mN/m was determined. The result in this test is not in line with the expected surface tension behaviour of the test substance. Cationic surfactants carrying two C18 alkyl chains, such as MDEA-Esterquat C16-18 and C18 unsatd. , are designed to possess surface active properties and typically exhibit surface tension values as low as 27 mN/m (depending on the area per molecule) when studied on a Langmuir film balance. Therefore due to the intrinsic properties (crystallization) of this double-chain cationic amphiphile at temperatures below the melting point no reliable results were obtained using the ring method.
- Executive summary:
The surface tension of MDEA-Esterquat C16-18 and C18 unsatd. was investigated in a study conducted according to OECD Guideline 115 (Surface Tension of Aqueous Solutions; 1995) and EU Method A.5 (Surface Tension; 2008). A mean surface tension (5 -9 measurements) of 68.3 mN/m was determined. The result in this test is not in line with the expected surface tension behaviour of the test substance. Cationic surfactants carrying two C18 alkyl chains, such as MDEA-Esterquat C16-18 and C18 unsatd. , are designed to possess surface active properties and typically exhibit surface tension values as low as 27 mN/m (depending on the area per molecule) when studied on a Langmuir film balance. Therefore due to the intrinsic properties (crystallization) of this double-chain cationic amphiphile at temperatures below the melting point no reliable results were obtained using the ring method.
Reference
The surface tension of MDEA-Esterquat (Rewoquat V 10057) was investigated in a study conducted according to OECD Guideline 115 (Surface Tension of Aqueous Solutions; 1995) and EU Method A.5 (Surface Tension; 2008). A mean surface tension (5 -9 measurements) of 68.3 mN/m at 20°C was determined. The result in this test is not in line with the expected surface tension behaviour of the test substance. Cationic surfactants carrying two C18 alkyl chains, such as MDEA-Esterquat, are designed to possess surface active properties and typically exhibit surface tension values as low as 27 mN/m (depending on the area per molecule) when studied on a Langmuir film balance. Typically, molecules dissolved in water tend to adsorb to the air/water interface in the form of a monolayer, often in the form of aggregates of spherical micelles. As a consequence, the surface tension of water (72 mN/m) is somewhat reduced. Double-chain surfactants, however, cannot form spherical micelles for geometric reasons and tend to form bilayer aggregates such as vesicles (Sperically closed bilayers) at the air/water interface. Another aspect which has to be considered with respect to bilayer aggregates is the presence of a phase transition temperature of the alkyl chains within the bilayer. In the so-called solid-analogue state, the alkyl chains are crystallized, and there is neither flexibility of the bilayer vesicle nor any lateral diffusion of the amphiphiles within the bilayer. Above the transition temperature, the alkyl chains in the bilayer are molten and the quat molecules have some mobility within the layer. For double-chain cationic amphiphiles carrying predominantly saturated C18 alkyl chains, like MDEA-Esterquat, this transition temperature is well above room temperature, typically in the range of 40 -45°C. The presence of crystallized alkyl chains at 20°C has important implications for the determination of surface activity according to the OECD guidelines. When a solid surfactant aggregate reaches the air/water interface, there is no mobility of the (crystallized) surfactant molecules which could allow the formation of a surfactant monolayer. Hence, the surface tension will not be significantly reduced. Therefore, the results obtained in the present study only confirm that surface tension measurements below the melting point of double-chain amphiphiles do not yield meaningful results when using the ring method.
Description of key information
A mean surface tension of 68.3 mN/m at 20°C was determined.
Key value for chemical safety assessment
Additional information
The surface tension of MDEA-Esterquat C16-18 and C18 unsatd. was investigated in a study conducted according to OECD Guideline 115 (Surface Tension of Aqueous Solutions; 1995) and EU Method A.5 (Surface Tension; 2008).
The result in this test is not in line with the expected surface tension behaviour of the test substance (please refer to the discussion on surface tension in the Endpoint summary "Physical and chemical properties").
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