Molecular formular: Fe3O4 Molecular Weight: 231.53 Properties: Black or black red powder,insoluble in water, alcohol; soluble in concentrated acid, hot strong acids, Melting Point:1594℃, Relative Density:5.18 Applications:It is widely applied to color of building material, water color, greasepaint, applied to making alnico in electronics and telecommunication, and applied to steel defect detection in battery and mechanical industry. Package: 25kg PP bag