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Pyrophoric Uranium:

A chemical that will ignite spontaneously in air at or below a temperature of 130 Fahrenheit (54.5 C). Uranium metal is pyrophoric especially when finely divided. This is a fire hazard as any pyrophoric substance can spontaneously self-ignite when exposed to normal atmospheric conditions. Uranium and its compounds are highly toxic, both from a chemical and radiological standpoint.

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