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EC number: 812-244-2 | CAS number: 957209-18-6
- 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
Endpoint summary
Administrative data
Description of key information
Novec 7700 is a segregated hydrofluoroether. It is a liquid at room temperature with a vapor pressure of 150 Pa (1.1 mm Hg) at 25 °C. Novec 7700 water solubility is 0.407 µg/L at 22.6 °C. Its measured Henry’s law constant is 982 atm∙m³/mol at 23.4 °C. Releases of Novec 7700 are expected to be to the atmosphere based upon its intended uses. Fugitive emissions may occur at transfer points. During routine use, there is no anticipated release to water or wastewater in the EU. The vapor pressure, low water solubility and high Henry’s law constant combine to move Novec 7700 from any terrestrial compartment into the atmosphere. Once in the atmospheric compartment, this compound will not partition to terrestrial or aquatic compartments based on the same properties. Therefore, this compound will remain in the atmosphere when released from industrial or professional applications. Information on Novec 7700 biodegradability is provided by readacross from the ethoxylated analogue Novec 7800. Novec 7800 was not degraded in an OECD301C test done with modifications for a volatile substance.
As explained in the justification for readacross, the structural difference between Novec 7700 and Novec 7800 is unlikely to lead to a difference in biodegradation potential. No biodegradation of Novec 7700 is expected under environmental conditions based on the Novec 7800 result. Degradation of Novec 7700 in the environment is expected to be by indirect photolysis in the troposphere, for which an overall half-life of 3.9 years was measured. A short-lived diketone intermediate subject to rapid (t½ of 0.9 days) direct photolysis was detected in this experiment. Major degradation product was carbonyl difluoride for both Novec 7700 and the diketone intermediate; carbonyl difluoride hydrolyzes spontaneously under environmental conditions. Carbonyl difluoride detection may have been confounded with acetyl fluoride, as the two are difficult to distinguish spectrographically and branching along the substance backbone would lead to acetyl fluoride production. The expected final degradation products are hydrofluoric acid (HF, CAS# 7664-39-3), trifluoroacetic acid (TFA, CAS# 76-05-1) and carbon dioxide. These materials are miscible in water and are completely ionized in rainwater. They are expected to undergo wet deposition with no further significant transformation upon return to the troposphere. Novec 7700 has a measured log Kow of 6.6. However, Novec 7700 is expected to have little potential to bioaccumulate. Given its extremely short half-life in the aquatic compartment due to volatilization, it will not exist in aquatic environments or organisms for a sufficient time to allow partitioning into lipid tissues or testing of bioconcentration under relevant conditions.
As Novec 7700 is a highly fluorinated substance, global warming and ozone depletion potentials may be of interest. USEPA states flatly that hydrofluorocarbons do not deplete ozone because they lack chlorine or bromine. Fluorine radicals do not contribute to ozone depletion because of fast quenching of F* by water or hydrogen donors, slow reaction of FO* radicals with oxygen, and obligate reformation of F* in the pathway (1). F* radicals are rapidly and irreversibly removed from the atmosphere after quenching as HF. Therefore, neither Novec 7700 nor any of its acidic photodegradation products contribute to ozone depletion. Global warming potential depends on three factors: absorption of infrared radiation, area of the spectrum the absorption occurs and lifetime of the material in the atmosphere. Novec 7700 has an estimated GWP of 420 over a 100-year integrated time horizon.
Reference:
1) A.J. Colussi, M.A. Crela. 1994. Rate of the reaction between oxygen monofluoride and ozone. Implications for the atmospheric role of fluorine. Chem. Phys. Lett. Vol. 229, pp. 134-138.
Additional information
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.
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