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Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-06-30 to 2010-08-12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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.
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: RM W2C + WC
3. CATEGORY APPROACH JUSTIFICATION: See Annex 1 in CSR
4. DATA MATRIX: See Annex 1 in CSR
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 degrees C
Remarks:
at atm. press. of 1013.0 hPa

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.

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.
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Reliability assigned by secondary source. Only secondary source reviewed.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
GLP compliance:
not specified
Relative self-ignition temperature:
> 300 °C
Remarks on result:
other:
Remarks:
at atm. press. of 1013.0 hPa

The autoignition temperature depends on the type of powder. For a commercially available powder, the observed auto ignition temperature was > 300 °C. Pressure was not reported, assumed to be conducted under standard conditions.

Description of key information

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

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