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EC number: 200-609-3 | CAS number: 65-45-2
- 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

Density
Administrative data
Link to relevant study record(s)
- Endpoint:
- density
- Remarks:
- density
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 3 (not reliable)
- Rationale for reliability incl. deficiencies:
- other: Non-guideline study. Very limited experimental detail. Purity of the sample not addressed.
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Liquid pycnometer, using kerosene as the working liquid.
- GLP compliance:
- no
- Type of method:
- pycnometer method
- Type:
- density
- Density:
- 1.33 g/cm³
- Temp.:
- 25 °C
- Remarks on result:
- other: ±0.04
- Conclusions:
- The results are not considered reliable, though the values are considered to be plausible. Uncertainty in the result was quantified.
- Endpoint:
- density
- Remarks:
- density
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 3 (not reliable)
- Rationale for reliability incl. deficiencies:
- other: Non-guideline study. Very limited experimental detail. Source and purity of the sample addressed.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- No data.
- GLP compliance:
- no
- Type of method:
- air comparison pycnometer (for solids)
- Type:
- density
- Density:
- 1.37 g/cm³
- Temp.:
- 23 °C
- Conclusions:
- The results are not considered reliable, though the values are considered to be plausible.
- Endpoint:
- density
- Remarks:
- density
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 3 (not reliable)
- Rationale for reliability incl. deficiencies:
- other: see 'Remark'
- Remarks:
- Non-standard method. The density derived from crystallographic measurements will represent the ideal case of a single crystal. The crystal structure was successfully solved with a good quality data set (final R=5.6%). The structure does not require special consideration (e.g. contains solvent; very dense or very open structure; large number of subunits in the assymetric unit cell, or heterogenous subunits, such that the symmetry or packing is uncertain). Temperature only reported as "room temperature". No information on purity of the substance. In particular limited information given on the determination of the lattice constants, from which the unit-cell volume, and hence density is derived.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The density is calculated from the known volume of the unit cell, the number of molecules per unit cell, and the molecular weight. The unit cell and number of molecules per unit cell are derived from the solved x-ray crystal structure.
- GLP compliance:
- no
- Type of method:
- other: x-ray crystallography
- Type:
- density
- Density:
- 1.351 g/cm³
- Remarks on result:
- other: Room temperature; calculated from crystal structure.
- Conclusions:
- Exact temperature and purity of the substance were not reported, nor were details on lattice constant determination, which are critical for the unit cell volume. The crystal structure was successfully solved with a good quality data set (final R=5.6%). The density derived from crystallographic measurements will represent the ideal case of a single crystal. The structure does not require special consideration (e.g. contains solvent; very dense or very open structure; large number of subunits in the assymetric unit cell, or heterogenous subunits, such that the symmetry or packing is uncertain).
Referenceopen allclose all
a=12.901(2)Å , b=4.982(1)Å, c=20.987(3)Å, B=91.50(2)°, Z=8
Space group: I2/a, 2θ(max)=70°, measured reflections=6167, unique reflections=2970, R=5.6%, wR=4.8%
Description of key information
1.33±4g/cm3, 25°C, pycnometery, Gloria 1963
1.351g/cm3, 25°C, crystallography, Pertlik 1990
1.37g/cm3, 23°C, air pycnometery, Lerk 1977
1.32g/cm3, flotation and pycnometery, McCrone 1953
1.308g/cm3, crystallography, McCrone 1953
Key value for chemical safety assessment
- Relative density at 20C:
- 1.34
Additional information
Several density measurements were available from the published literature. Although none of the published densities were measured according to guidelines, there was good agreement between all reported values, using different techniques and performed by independant laboratories, on independant samples. As a result, the average of the values (n=5) was selected for risk assessment purposes. Considering the good agreement between independent results, based on the weight-of-evidence the available data is considered to be reliable and adequate for classification and labelling, and risk assessment purposes in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.2.
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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