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Old 05-06-2016, 02:18 PM   #40
Leonardo
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PYROPHORIC

liable to ignite spontaneously on exposure to air.

(of an alloy) emitting sparks when scratched or struck.

Zirconium and titanium are Pyrophoric at about sub 400 micron.

Powder will ignite simply by pouring it off a piece of paper.
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