Iron oxide pigment is a type of pigment with good dispersibility, excellent light resistance, and weather resistance. Iron oxide pigments mainly refer to four types of coloring pigments, namely iron oxide red, iron yellow, iron black, and iron brown, based on iron oxides. Among them, iron oxide red is the main pigment (accounting for about 50% of iron oxide pigments), and mica iron oxide used as anti rust pigments and magnetic iron oxide used as magnetic recording materials also belong to the category of iron oxide pigments. Iron oxide is the second largest inorganic pigment after titanium dioxide and also the largest colored inorganic pigment. More than 70% of all consumed iron oxide pigments are prepared by chemical synthesis methods, known as synthetic iron oxide. Synthetic iron oxide is widely used in building materials, coatings, plastics, electronics, tobacco, medicine, rubber, ceramics, printing ink, magnetic materials, paper making and other fields due to its high synthetic purity, uniform particle size, wide chromatography, multiple colors, low price, non-toxic, excellent coloring and application properties, and ultraviolet absorption properties. Iron oxide pigments are widely used in coatings, paints, and inks due to their non-toxic, non bleeding, low cost, and ability to form various shades. Coatings are composed of film-forming substances, pigments, fillers, solvents, and additives. It has developed from oil-based coatings to synthetic resin coatings, and various coatings cannot do without the application of pigments, especially iron oxide pigments, which have become an indispensable pigment variety in the coating industry.

Iron oxide pigments used in coatings include iron yellow, iron red, iron brown, iron black, mica iron oxide, transparent iron yellow, transparent iron red, and translucent products, of which iron red is the most important one in large quantities and wide range.

Iron red has excellent heat resistance, does not change color at 500 ℃, and does not change its chemical structure at 1200 ℃, making it extremely stable. It can absorb the ultraviolet spectrum in sunlight, so it has a protective effect on the coating. It is resistant to dilute acids, alkalis, water, and solvents, making it have good weather resistance.