Iron oxide is an inorganic substance with the chemical formula Fe2O3. Red dark red amorphous powder. The relative density is 5~5.25, the melting point is 1565°C (decompose at the same time). Insoluble in water, soluble in hydrochloric acid sulfuric acid, slightly soluble in nitric acid. It has strong hiding power tinting power, no oil permeability water permeability. Stable in the atmosphere sunlight, resistant to polluted gases, high temperature alkali. The dry-process products of this product have coarse hard crystal particles, which are suitable for magnetic materials, polishing abrasive materials. Wet-processed products have small soft crystal particles, which are suitable for coating ink industry. Magnesia