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Physical & Chemical properties

Auto flammability

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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:
reference to same study
Qualifier:
according to
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

 Test Cube Size, mm  Test Temp., deg. C  Did sample Temp. Exceed Test Temp. + 60 deg. C?  Time to reach 60 deg. 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

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:
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 degree C.

Description of key information

The self-ignition temperature for tungsten metal was reported to be 310 degrees 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.