The molecular formula of iron oxide red is Fe2O3, the main component is ferric oxide, it is a red powder, there are two kinds of natural and artificial, the natural one is called Xihong, which is basically pure iron oxide, with a fineness of 0.4-20um and a melting point of 1565 ( Decomposition), emit oxygen when burning, and can be reduced to iron by hydrogen and -carbon oxide; man-made is synthetic iron oxide red, the phase density is 5-5.25, its crystal structure and physical properties are very different, the color changes From orange light to blue light to purple light, it has great covering power and tinting power, excellent light resistance, high temperature resistance, and resistance to atmospheric influence, foul gas, and all alkalis, only when heated in concentrated acid. will gradually dissolve.
There are two kinds of iron oxide red, natural and synthetic. The natural one is called Xihong, with a relative density of 55.25. The fineness is 0.4-20um. Melting point 1565 (decomposition). Oxygen is released when burning, which can be reduced to iron by hydrogen and carbon oxide. Insoluble in water, soluble in hydrochloric acid, sulfuric acid, slightly soluble in nitric acid and yeast. It has excellent light resistance, high temperature resistance, acid resistance, alkali resistance and rust resistance. Good dispersibility, strong tinting strength and covering power, no oil permeability and water permeability. Nontoxic. The high allowable concentration in the air is 5mg/m3.
