Registration Dossier
Registration Dossier
Diss Factsheets
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EC number: 915-093-1 | CAS number: -
- 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:
- read-across based on grouping of substances (category approach)
- Adequacy of study:
- key study
- Study period:
- 2010-06-30 to 2010-08-12
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- GLP study, conducted according to N.4 in Part III, subsection 33.3.1.6 of the United Nations Recommendations on the Transport of Dangerous Goods-Manual of Tests and Criteria 4th Revised Edition. Detailed sample characterization was included. The reliability of this study for the substance tested is a K1, but in application of read-across to a different substance, ECHA's guidance specifies that the score can be a maximum of a K2.
- Justification for type of information:
- 1. HYPOTHESIS FOR THE CATEGORY APPROACH: The hypothesis is that properties are likely to be similar or follow a similar pattern because of the presence of a common metal ion, in this case tungstate.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES):
Source: Tungsten Carbide
Target: Fused tungsten carbide
3. CATEGORY APPROACH JUSTIFICATION: See Annex 3 in CSR
4. DATA MATRIX: See Annex 3 in CSR - Reason / purpose for cross-reference:
- read-across: supporting information
- Qualifier:
- according to guideline
- Guideline:
- other: to N.4 in Part III, subsection 33.3.1.6 of the United Nations Recommendations on the Transport of Dangerous Goods-Manual of Tests and Criteria 4th Revised Edition.
- GLP compliance:
- yes
- Key result
- Relative self-ignition temperature:
- > 140 °C
- Remarks on result:
- other: 100 mm cube at 140 °C
- Conclusions:
- None of the test substance samples ignited during the test. Furthermore, the sample temperature for all three test substance samples never exceeded the oven temperature by 60 °C. Therefore, it can be concluded that tungsten carbide is not a self-heating substance at the particle sizes tested.
- Executive summary:
Due to the similar chemical constituency and structure between the source substance (tungsten carbide) and the target substance (fused tungsten carbide), the physico-chemical properties would be expected to be the same or sufficiently similar such that application of this read-across is appropriate for this endpoint. For more details, refer to the attached read-across approach document.
Reference
100 mm cube at 140 °C = no ignition
None of the test substance samples ignited during the test. Furthermore, the sample temperature for all three test substance samples never exceeded the oven temperature by 60 °C. Therefore, it can be concluded that tungsten carbide is not a self-heating substance at the particle sizes tested.
Description of key information
The auto-flammability/self-heating of fused tungsten carbide is expected to be the same as/similar to tungsten carbide. Three samples of tungsten carbide were tested in a standard test for self-heating. None of the test substance samples ignited during the test. Furthermore, the sample temperature for all three test substance samples never exceeded the oven temperature by 60°C. Therefore, it can be concluded that tungsten carbide is not a self-heating substance at the particle sizes tested. Testing was conducted down to a particle size of 0.53 µm (FSSS size) (nominally 0.47 µm).
Key value for chemical safety assessment
Additional information
Due to the similar chemical constituency and structure between the source substance (tungsten carbide) and the target substance (fused tungsten carbide), the physico-chemical properties would be expected to be the same or sufficiently similar such that application of this read-across is appropriate for this endpoint. For more details, refer to the attached read-across approach document.
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