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EC number: 273-321-9 | CAS number: 68956-82-1
- 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
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- thermal analysis
- Decomposition:
- yes
- Decomp. temp.:
- 180 °C
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Remarks:
- Michelin analysis proved that these results are not correct (see endpoint study record "melting point / freezing point Michelin Report").
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- thermal analysis
- Melting / freezing pt.:
- 180.5 °C
- Decomposition:
- no
- Sublimation:
- no
Referenceopen allclose all
Description of key information
The report edited by Defitrace indicates melting point and boiling point for this substance, whereas product Y is a cobalt organometallic compound with high molecular weight (662 g/mol) that decomposes thermally without change of state. We contest also the conclusions of this study.
We remind too that cobalt is not particularly volatile (melting point = 1495 °C, boiling point = 2927 °C).
We conducted TGA measurements to follow weight losses of the product as function of temperature. DSC measurements were then performed to characterise potential thermal phenomena’s.
Melting point: endothermic peak without weight variation
Boiling point: endothermic peak without degradation of the product. At the end of the transition, % losses = 100 %.
Key value for chemical safety assessment
Additional information
Discussion:
- Phenomenon considered as melting point by Defitrace: weak endothermic peak at 180.5 °C under argon (DSC).
The phenomenon observed by Defitrace near 170 °C is excessively weak and expanded: could not be characteristic of a melting point. We did not observe this phenomenon under nitrogen or helium in our DSC curves. We observed losses (≈ 4 %) between 150 °C and 200 °C that mainly relate to volatile organic impurities vaporisation.
Under air, only exothermic peaks are observed. Near 180 °C, visual observations show a significant browning of product Y, which becomes partially liquid: sign of chemical modification (oxidation) of the product. The substance decomposes before melting occurs.
- Phenomenon considered as boiling point by Defitrace: endothermic peak near 379 °C under argon (DSC).
We observed this phenomenon by Michelin between 400 and 470 °C (E = 100 to 200 J/g). Under nitrogen, the residue at 750 °C is about 9.2 % (black residue) corresponding to cobalt as metal. It means that there was no vaporisation of the compound, rather a degradation and loss of organic matter.
Under air, only exothermic peaks are observed.
Conclusions:
No obvious melting or boiling phenomenon could be seen on DSC thermograms. The endothermic phenomenon near 380 °C does not correspond to product Y boiling but product degradation with matter loss, confirmed by the presence of an inorganic residue at 750 °C (TGA). There is also neither melting nor boiling of the product.
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