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Diss Factsheets
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EC number: 253-930-6 | CAS number: 38436-16-7
- 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
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Water solubility [[2-(perfluorobutyl)ethyl]dichloro(methyl)silane]: Not relevant
Water solubility [[2-(perfluorobutyl)ethyl]methylsilanediol]: 2 mg/l at 20°C (QSAR)
Key value for chemical safety assessment
Additional information
The requirement to conduct a water solubility study for the submission substance is waived on the basis that in contact with water, it hydrolyses very rapidly to form [2-(perfluorobutyl)ethyl](methyl)silanediol and hydrochloric acid. The silanol hydrolysis product, [2-(perfluorobutyl)ethyl](methyl)silanediol, may undergo condensation reactions in water, for further details, see the overall physicochemical properties discussion.
The hydrolysis product, [2-(perfluorobutyl)ethyl](methyl)silanediol, is slightly soluble in water based on the calculated solubility of 2 mg/l using a QSAR method. The prediction is considered to be valid for use in calculation of the Henry's Law Constant and for environmental exposure modelling and toxicokinetics modelling because it is considered to adequately describe the partitioning behaviour of the substance.
The chemical structure contains a perfluorobutyl chain; fluorocarbons have very low solubility in water, relative to hydrocarbons of equivalent chain length, (e.g. Horvath 1982), so it would be expected that a substance with this R group would be of low solubility. The effective limits of solubility of both the parent substance and monomeric silanol hydrolysis products are very low. Condensation phenomena may limit the extent of hydrolysis under conditions at which the solubility of either parent or oligomer is exceeded. The predicted rates presented above relate to dilute conditions. These factors are important in any consideration of aqueous behaviour and properties.
Horvath, A.L., 1982. Halogenated hydrocarbons: solubility-Miscibility with water. CRC press 26 Feb 1982
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