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Diss Factsheets
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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
Flammability
Administrative data
Link to relevant study record(s)
- Endpoint:
- substances / mixtures which in contact with water emit flammable gases
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the experience in production or handling shows that the substance does not react with water, e.g. the substance is manufactured with water or washed with water
- Endpoint:
- pyrophoric solids
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied
- Endpoint:
- self-heating substances / mixtures
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Endpoint:
- flammable 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 substance 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
- Specific details on test material used for the study:
- Initially, this substance was considered as a reaction mass and named "reaction mass of praseodymium(III,IV) oxide and zirconium dioxide".
But after discussion with ECHA, it was stipulated that it is a substance and we had to change the name to "Dipraseodymium dizirconium heptaoxide".
So, in the different endpoints with studies, the sustance named "reaction mass of praseodymium(III,IV) oxide and zirconium dioxide" corresponds to the substance Dipraseodymium dizirconium heptaoxide. They are the same, the analytical dossier did not changed. - Test procedure:
- other: based on read-across
- Remarks on result:
- other: The reaction mass of praseodymium(III,IV) oxide and zirconium dioxide is not considered to be flammable.
- 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 UN N1 guideline demonstrated that praseodymium(III,IV) oxide is not flammable. Second, zirconium dioxide is concluded not to be flammable 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 flammable either.
- Endpoint:
- flammable 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:
- UN Manual of Tests and Criteria: Test N.1 (Test method for readily combustible solids)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Test procedure:
- burning rate test: preliminary screening test
- Burning time:
- s
- Remarks on result:
- substance does not ignite and propagate combustion either by burning with flame or smouldering along 200 mm of the powder train within the 2 minutes test period
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- Under the conditions of this study, the test material is not a flammable or readily combustible solid.
Referenceopen allclose all
Preliminary Screening Test
The pile of test material failed to ignite during the 2 minutes that the Bunsen flame was applied.
Burning Rate Test
Due to the results obtained during the preliminary screening test, no definitive test was performed.
Description of key information
There is no experimental data available for dipraseodymium dizirconium heptaoxide on the endpoints of flammability, pyrophoricity, self-heating and flammability in contact with water. Based on information on its oxide constituents, the substance is not considered to be flammable nor pyrophoric nor flammable in contact with water, nor is it expected to exhibit self-heating properties.
Key value for chemical safety assessment
- Flammability:
- not classified
Additional information
1. Information on praseodymium(III,IV) oxide
Based on a guideline study (White, 2013; Klimisch 1), it is concluded that praseodymium(III,IV) oxide is not a flammable substance. In addition to this study, based on the physical and chemical properties of the substance and experience in its handling and use, praseodymium(III,IV) oxide is not expected to be pyrophoric or flammable in contact with water. Further, based on the observations made in the autoflammability test performed according to the EU A.16 guideline, the substance is also concluded not to have self-heating properties.
2. Information on zirconium dioxide
Zirconium dioxide is considered non-flammable since zirconium is in its highest possible oxidation state (+IV) and is therefore not capable of further reaction with oxygen. In addition, based on its physical and chemical properties and experience in its handling and use, it is concluded that zirconium dioxide is not pyrophoric or flammable in contact with water and does not have self-heating properties.
3. Conclusion on the substance dipraseodymium dizirconium heptaoxide
Based on above mentioned information on its individual oxide, the substance dipraseodymium dizirconium heptaoxide is not considered to be flammable nor pyrophoric nor flammable in contact with water, nor is it expected to exhibit self-heating properties.
Justification for classification or non-classification
Based on information available for its individual constituents, the substance dipraseodymium dizirconium heptaoxide is not considered to be flammable nor phyrophoric nor flammable in contact with water, nor is it expected to exhibit self-heating properties. The substance is not classified for any of these physical hazards.
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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