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Physical & Chemical properties

Auto flammability

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Endpoint:
relative self-ignition temperature (solids)
Data waiving:
other justification
Justification for data waiving:
other:
Justification for type of information:
Data waiving
Reason: Self-heating is not a relavent hazard for this compound.
Justification: According to the ECHA Guidance on information requirements and chemical safety assessment Chapter R.9: Physico-chemical hazards May 2008, the relative self-ignition temperature is the minimum temperature at which a certain volume of a substance will ignite under defined conditions. The majority of tungsten in this compound is in its highest possible oxidation state (VI) and is incapable of further reaction with oxygen. Therefore, this compound is not expected to ignite. Furthermore, the high self-ignition values reported for powders of other tungsten compounds (>300 °C for tungsten carbide; from HC Starck, 2005, as cited in OECD, 2005) support the conclusion that self-heating is not a relevant hazard for this compound. (HC Starck, 2005; OECD, 2005)

Description of key information

According to the ECHA Guidance on information requirements and chemical safety assessment Chapter R.9: Physico-chemical hazards May 2008, the relative self-ignition temperature is the minimum temperature at which a certain volume of a substance will ignite under defined conditions. The majority of tungsten in this compound is in its highest possible oxidation state (VI) and is incapable of further reaction with oxygen. Therefore, this compound is not expected to ignite. Furthermore, the high self-ignition values reported for powders of other tungsten compounds (>300 °C for tungsten carbide; from HC Starck, 2005, as cited in OECD, 2005) support the conclusion that self-heating is not a relevant hazard for this compound. (HC Starck, 2005; OECD, 2005)

Key value for chemical safety assessment

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