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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:
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 degrees 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 degrees 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 degrees 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:
reference to same study
Qualifier:
according to
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 degrees 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