The molecular formula of iron oxide red is Fe2O3, and the main component is iron trioxide. It is a red powder. There are two kinds of natural and artificial. The natural is called western red, which is basically pure iron oxide, with a fineness of 0.4-20um and a melting point of 1565 ( Decomposition). Oxygen is released during burning, which can be reduced to iron by hydrogen and carbon oxide; artificial red is synthetic iron oxide, with a phase density of 5-5.25, and its crystal structure and physical properties are very different, and the color changes Between orange light to blue light to purple light, the hiding power and coloring power are very large, it has excellent light resistance, high temperature resistance, and resistance to atmospheric influence, resistance to dirty gases, resistance to all alkalis, only when heated in concentrated acid Will gradually dissolve under the water.
There are two types of iron oxide red: natural and synthetic. The natural one is called West Red, with a relative density of 55.25. The fineness is 0.4～20um. Melting point 1565 (decomposition). Oxygen is released during burning, which can be reduced to iron by hydrogen and carbon oxide. Insoluble in water, soluble in hydrochloric acid and sulfuric acid, slightly soluble in nitric acid and ferment. It has excellent light resistance, high temperature resistance, acid resistance, alkali resistance and rust resistance. Good dispersibility, strong tinting power and hiding power, no oil permeability and water permeability. Non-toxic. The high allowable concentration in the air is 5mg/m3.
