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EC number: 277-551-0 | CAS number: 73609-36-6
- 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
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- other:
Reference
Description of key information
Surface tension [2-(perfluorohexyl)ethyl]dichloro(methyl)silane: Not relevant due to very rapid hydrolysis in contact with water
Surface tension
[2-(perfluorohexyl)ethyl]methylsilanediol: <22 mN/m at 20°C (OECD 115)
Key value for chemical safety assessment
Additional information
The requirement to conduct a surface tension study for the submission substance is waived in accordance with Section 2 of REACH Annex XI, because in contact with water, the substance reacts very rapidly to form [2-(perfluorohexyl)ethyl]methylsilanediol and hydrochloric acid. Also, the surface tension of the silanol hydrolysis product, [2-(perfluorohexyl)ethyl]methylsilanediol was not conducted in accordance with Column 2 of REACH Annex VII, because the silanol hydrolysis product has a predicted water solubility of <1 mg/L at 20°C. The surface tension of the silanol hydrolysis product, [2-(perfluorohexyl)ethyl]methylsilanediol has been read-across from [2-(perfluorohexyl)ethyl]silanetriol and octylsilanetriol.
The surface tension study was conducted using an analogue trimethoxy substance, [2-(perfluorohexyl)ethyl]trimethoxysilane, (CAS 85857-16-5), under conditions in which the results would reflect the surface tension of the hydrolysis product. Under dilute conditions in water, the analogue substance [2-(perfluorohexyl)ethyl]trimethoxysilane has predicted hydrolysis half-lives of 0.4 h at pH 4, 0.4 h at pH 5, 8.8 h at pH 7, 0.1 h at pH 9 and 20-25°C. The products of hydrolysis of [2 -(perfluorohexyl)ethyl]trimethoxysilane are [2-(perfluorohexyl)ethyl]silanetriol and methanol. The surface tension study used a test substance concentration of 1 g/l at 20°C and 43 h solution age. At the age of the solution used during the study, (43 h), hydrolysis would have occurred and the surface tension result is considered to reflect the silanol hydrolysis product(s) under conditions where the limit of solubility is significantly exceeded. Therefore, the study results are considered to indicate that the hydrolysis product, [2-(perfluorohexyl)ethyl]silanetriol, has a measured surface tension value of <22 mN/m at 20°C and 1 g/L. This value is also supported by available measured data for the read-across substance octylsilanetriol.
The surface tension of octylsilanetriol was determined by the addition of octyltrichlorosilane to water. Trichloro(octyl)silane (CAS No 5283-66-9) in contact with water reacts very rapidly with a half-life of <1 minute at pH 4, pH 7 and pH 9 and 25°C to form octylsilanetriol and hydrochloric acid. Both buffered (pH 7) and non-buffered solutions with solution age of 3 days and 4 hours respectively were used during the study. A surface tension of 53 mN/m at 20°C and 100 mg/l using EU Method A.5 was obtained for the buffered solution of octylsilanetriol. The result indicates that octylsilanetriol is slightly surface active.
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.
Therefore, on the basis of available information, the silanol hydrolysis product, [2-(perfluorohexyl)ethyl]methylsilanediol is considered to be surface active.
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