Registration Dossier
Registration Dossier
Data platform availability banner - registered substances factsheets
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Diss Factsheets
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 832-253-5 | CAS number: 12165-18-3
- 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
Auto flammability
Administrative data
Link to relevant study record(s)
- Endpoint:
- relative self-ignition temperature (solids)
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 17 July 2012 - 21 January 2013
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.16 (Relative Self-Ignition Temperature for Solids)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks on result:
- other: The test material has been determined not to have a self-ignition temperature below 400°C.
- Conclusions:
- The test material has been determined not to have a self-ignition temperature below 400°C.
- Endpoint:
- relative self-ignition temperature (solids)
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- weight of evidence
- Justification for type of information:
- Data available on the individual constituents of the reaction mass were considered to conclude on the endpoint. For praseodymium(III,IV) oxide, an experimental study is available, which is used for read across. For zirconium dioxide no data are available on the endpoint, because there was no need for performing an experimental study (study waived, see further). The read across justification document is attached to IUCLID Section 13.
- Reason / purpose for cross-reference:
- read-across source
- Remarks on result:
- other: The reaction mass of praseodymium(III,IV) oxide and zirconium dioxide is not considered to be autoflammable.
- Remarks:
- This conclusion is based on two types of information. First, the results of an experimental study performed with praseodymium(III,IV) oxide according to the EU A.16 guideline demonstrated that praseodymium(III,IV) oxide has no self-ignition temperature when heated up to 400°C. Second, zirconium dioxide is concluded not to be autoflammable either, based on the fact that inorganic oxides in which the element is in its highest possible oxidation state are incapable of further reaction with oxygen, which is the case for zirconium dioxide (zirconium in oxidation state +IV). Consequently, the reaction mass of these two oxides can safely be concluded not to be autoflammable either.
Referenceopen allclose all
The test material was a brown powder. Whilst heating, the sample showed no significant temperature rise above the oven temperature. On completion of the test, the cube remained full of brown powder.
Description of key information
No experimental data is available on the autoflammability of dipraseodymium dizirconium heptaoxide. However, based on information on the individual constituents of the substance, it can be concluded that the substance is not autoflammable. This conclusion is based on two types of information. First, the results of an experimental study performed with praseodymium(III,IV) oxide according to the EU A.16 guideline demonstrated that praseodymium(III,IV) oxide has no self-ignition temperature when heated up to 400°C. Second, zirconium dioxide is concluded not to be autoflammable either, based on the fact that inorganic oxides in which the element is in its highest possible oxidation state are incapable of further reaction with oxygen, which is the case for zirconium dioxide (zirconium in oxidation state +IV). Consequently, the substance composed of these two oxides can safely be concluded not to be autoflammable either.
Key value for chemical safety assessment
Additional information
1. Information on praseodymium(III,IV) oxide
Based on a guideline study (White, 2013; Klimisch 1), praseodymium(III,IV) oxide has been determined to have no self-ignition temperature below 400°C.
2. Information on zirconium dioxide
Zirconium dioxide is an inorganic oxide in which zirconium is in its highest possible oxidation state (+IV) and is therefore incapable of further reaction with oxygen. Based on this information, zirconium dioxide is concluded not to be autoflammable.
3. Conclusion on the substance dipraseodymium dizirconium heptaoxide
Given that the substance is composed of praseodymium(III,IV) oxide and zirconium dioxide, above mentioned information allows concluding that the substance dipraseodymium dizirconium heptaoxide is not autoflammable either.
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.