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Diss Factsheets
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EC number: 231-143-9 | CAS number: 7440-33-7
- 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
![](https://poisoncentres.echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_physical-and-chemical-properties.png)
Auto flammability
Administrative data
Link to relevant study record(s)
- Endpoint:
- relative self-ignition temperature (solids)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- NA to: 2007-06-04
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with generally accepted scientific standards and described in sufficient detail
- Remarks:
- Well documented study conducted according to methodology specified in UN document ST/SG/AC.10/1/Rev.9, Recommendations of the Transport of Dangerous Goods, UN, New York and Geneva, 1995.
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- other: United States 49 CFR 173.125 & UN ST/SG/AC.10/1 (test method N4)
- GLP compliance:
- not specified
- Key result
- Relative self-ignition temperature:
- >= 100 °C
- Conclusions:
- The substance at the particle size tested (0.6-0.9 um), classifies as a Self-heating, Category 2 substance under CLP.
- Endpoint:
- relative self-ignition temperature (solids)
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- Data from peer-reviewed handbook or collection of data.
- Reason / purpose for cross-reference:
- reference to same study
- Principles of method if other than guideline:
- Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor was the experimental method.
- GLP compliance:
- not specified
- Key result
- Relative self-ignition temperature:
- ca. 310 °C
- Conclusions:
- A minimal ignition temperature of tungsten powder deposits (self-ignition temperature) is 310 °C.
Referenceopen allclose all
Test Cube Size, mm | Test Temp., ° C | Did sample Temp. Exceed Test Temp. + 60 ° C? | Time to reach 60 °C above oven temp. | Remarks |
100 | 140 | Yes | 57 minutes | Material ignited |
25 | 140 | No | N/A | Material did not appear visibly changed |
100 | 120 | Yes | 67 minutes | Material ignited |
100 | 100 | Yes | 79 minutes | Material ignited |
Sample is a self-heating substance of Division 4.2 Packaging group III
Description of key information
The self-ignition temperature for tungsten metal was reported to be 310 °C (particle size not reported). Also, tungsten metal was tested for self-heating and, at the particle size tested (0.6-0.9 um), classifies as a Self-heating, Category 2 substance under CLP.
Key value for chemical safety assessment
- Autoflammability / Self-ignition temperature at 101 325 Pa:
- 310 °C
Additional information
Results from a test conducted according to UN test method N4 resulted in ignition of the 100 mm cubes at 140, 120, and 100 °C. However no ignition was observed for the 25 mm cube at 140 °C.
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.
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