This is a black iron powder. Imported from China. It is Mesh 145. High Apparent Density. Attracts by magnets. Can rust. May also be used as a compound
Ferro Boron Powder, FeB, CAS 12006-84-7 - Heeger Materials
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Metal Powder: the New Zero-Carbon Fuel? - IEEE Spectrum
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IMP's Equiv-Carbonyl Iron Powder –Most excellent cost effective fine iron powder for engineering applications.
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