Iron Oxide Red Product Description CAS#1309-37-1

Iron Oxide Red, also known as ferric oxide, iron red, C.I. Pigment Red 101 (77491), has the chemical name α-ferric oxide (α-Fe₂O₃), molecular formula Fe₂O₃, and molecular weight 159.69. At room temperature, it is a red to purplish-red powder, with a hue transitioning from orange-red to purplish-red. Its melting point is 1538–1565°C, and its density is 4.5–5.1 g/cm³. In terms of solubility, iron oxide red is insoluble in water, alkalis, and organic solvents, but soluble only in hot, concentrated strong acids. Industrially, iron oxide red is mainly produced through precipitation (Penniman), Laux process, and dry calcination processes. Iron oxide red is one of the most economical and widely used red inorganic pigments in the world, possessing extremely high tinting strength and hiding power (second only to carbon black), as well as excellent lightfastness, heat resistance, and weather resistance. It is highly chemically inert, stable in the atmosphere and sunlight, and exhibits good UV impermeability. These unique properties make iron oxide red extremely valuable in a wide range of applications, including coatings, building materials, plastics, rubber, ceramics, inks, and cosmetics.

Iron Oxide Red Product Applications CAS#1309-37-1

Iron oxide red is an important inorganic red pigment and functional material, widely used in coatings, building materials, plastics, rubber, ceramics, inks, and daily chemicals industries.

In the coatings and paints industry, iron oxide red is an important raw material for anti-rust paint pigments and iron-red and purplish-brown coloring pigments. It is widely used in water-based interior and exterior wall coatings, powder coatings, oil-based paints (including epoxy, alkyd, amino, and other primers and topcoats), decorative paints, furniture paints, electrophoretic paints, enamel paints, automotive coatings, anti-corrosion coatings, and coil coatings. Iron oxide red primers have excellent anti-rust properties and can replace expensive red lead paint.

In the building materials field, iron oxide red is widely used for coloring artificial marble, terrazzo flooring, glazes, ceramics, colored bricks, colored tiles, colored cement products, concrete blocks, concrete roofing tiles, mortar, paving stones, and fiber cement.

In the plastics and rubber industry, iron oxide red is used for coloring thermosetting and thermoplastic plastics such as polyolefins, nylon, polystyrene, and epoxy resins; it is also widely used for coloring rubber products such as automobile inner tubes, airplane inner tubes, and bicycle inner tubes.