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A pyrophoric substance ( from Greek πυροφορος, purophoros, " fire-bearing ") is a substance that will ignite spontaneously in air ( cf.
hypergolic ).
Examples are iron sulfide and many reactive metals including uranium, when powdered or thinly sliced.
Pyrophoric materials are often water-reactive as well and will ignite when they contact water or humid air.
They can be handled safely in atmospheres of argon or ( with a few exceptions ) nitrogen.
Most pyrophoric fires should be extinguished with a Class D fire extinguisher for burning metals.

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