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relative self-ignition temperature (solids)
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study scientifically not necessary / other information available
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Reason: Other justification

Justification: According to the ECHA Guidance on information requirements and chemical safety assessment Chapter R.9: Physico-chemical hazards May 2008b, the relative self-ignition temperature is the minimum temperature at which a certain volume of a substance will ignite under defined conditions. 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.

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