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EC number: 257-473-3 | CAS number: 51851-37-7
- 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
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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:
- 2015-07-08
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- The study was conducted in accordance with a relevant test method and in compliance with a known quality system (ISO 17025)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Version / remarks:
- adopted on 27 July 1995
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Version / remarks:
- Council Regulation (EC) No. 440-2008 of 30 May 2008
- GLP compliance:
- no
- Other quality assurance:
- ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
- Type of method:
- ring method
- Key result
- Surface tension:
- 72.2 mN/m
- Temp.:
- 20 °C
- Conc.:
- 10 mg/L
- Conclusions:
- A surface tension value of 72.2 mN/m at 20°C was obtained for 10 mg/l of the test substance using a relevant test method. The result is considered to be reliable.
Reference
Table 1: Result
|
First run |
Second run |
Number of measurements |
10 |
31 |
Total time [min:s] |
8:24 |
19:47 |
Measurement time for last 10 runs [min:s] |
8:24 |
4:58 |
Measurement 1 |
72.40 |
51.15 |
Measurement 2 |
72.39 |
57.21 |
Measurement 3 |
72.39 |
61.09 |
Measurement 4 |
72.39 |
63.61 |
Measurement 5 |
72.39 |
65.40 |
Measurement 6 |
72.38 |
66.67 |
Measurement 7 |
72.38 |
67.61 |
Measurement 8 |
72.38 |
68.34 |
Measurement 9 |
72.37 |
69.02 |
Measurement 10 |
72.38 |
69.59 |
Measurement 11 |
- |
70.07 |
Measurement 12 |
- |
70.45 |
Measurement 13 |
- |
70.74 |
Measurement 14 |
- |
71.01 |
Measurement 15 |
- |
71.21 |
Measurement 16 |
- |
71.38 |
Measurement 17 |
- |
71.52 |
Measurement 18 |
- |
71.62 |
Measurement 19 |
- |
71.71 |
Measurement 20 |
- |
71.79 |
Measurement 21 |
- |
71.85 |
Measurement 22 |
- |
71.91 |
Measurement 23 |
- |
71.96 |
Measurement 24 |
- |
72.00 |
Measurement 25 |
- |
72.04 |
Measurement 26 |
- |
72.09 |
Measurement 27 |
- |
72.12 |
Measurement 28 |
- |
72.14 |
Measurement 29 |
- |
72.16 |
Measurement 30 |
- |
72.19 |
Measurement 31 |
- |
72.20 |
Surface tension [mN/m]1 |
72.39 |
72.08 |
Mean value [mN/m] |
72.2 |
1) Mean value of the last ten measurements
Description of key information
Surface tension [2-(perfluorohexyl)ethyl]triethoxysilane: 72.2 mN/m at 20°C (OECD 115)
Surface tension [2-(perfluorohexyl)ethyl]silanetriol: <22 mN/m at 20°C (OECD 115)
Key value for chemical safety assessment
- Surface tension:
- 72.2
- in mN/m at 20°C and concentration in mg/L:
- 10
Additional information
A measured surface tension value of 72.2 mN/m at 20°C and 10 mg/l was determined for the substance using a relevant test method and in compliance with a known quality system (ISO 17025). The measurements were taken after a solution age of 30 minutes to minimise hydrolysis of the substance. The result is considered to be reliable and is selected as key study. Under the condition of the study, the parent substance, [2-(perfluorohexyl)ethyl]triethoxysilane is considered as not surface active.
In contact with water, [2-(perfluorohexyl)ethyl]triethoxysilane hydrolyse moderately rapidly to form [2-(perfluorohexyl)ethyl]silanetriol and ethanol. Therefore, the surface tension of the silanol hydrolysis product can be read-across from [2-(perfluorohexyl)ethyl]trimethoxysilane following the discussion below.
A surface tension study was conducted using a trimethoxy structural analogue, [2-(perfluorohexyl)ethyl]trimethoxysilane (CAS 85857-16-5), of the registration subtance. Under dilute conditions in water, [2-(perfluorohexyl)ethyl]trimethoxysilane hydrolyses faster when compared with the registration substance (hydrolysis half-life of 12.5 at pH 7 and 20°C), with a hydrolysis half-life of 8.8 h at pH 7 and 20-25°C. The surface tension study was conducted at 20°C using a 1 g/l solution aged for 43 h. Given the hydrolysis half-life of the trimethoxy structural analogue, the surface tension result is considered to reflect that of the silanol hydrolysis product(s), [2-(perfluorohexyl)ethyl]silanetriol and ethanol. Therefore, under these conditions, the silanol hydrolysis product has a measured surface tension of <22 mN/m at 20°C and 1 g/l.
Based on this available information and uses of the substance; the silanol hydrolysis product, [2-(perfluorohexyl)ethyl]silanetriol, is considered to be surface active.
The corresponding monomeric silanetriol is expected to be surface active based on measured and read across data. The presence of fluorocarbon chains may mean that condensation products could have some surface activity. For these reasons, the effective limits of solubility of both the parent substance and monomeric silanol hydrolysis products are very low and all forms of the substance may have a tendency to enrich at surfaces rather than forming stable evenly dispersed solutions.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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