Iron Oxide Red
2.Molecular Formula: Fe2O3
3.Molecular Weight: 159.688
4.CAS: 1309-37-1
Description
Iron Oxide Red, whose main chemical composition is Fe₂O₃, is a common inorganic iron oxide red pigment. It usually exists in powder form. The color ranges from bright red to purple red, depending on the particle size and manufacturing process.
Features
Resistant to high temperature and chemical environment
Iron Oxide Red has the chemical formula Fe₂O₃, a molar mass of 159.688, a density of about 5.24g/cm³, and a melting point of up to 1565℃. Its main crystal form α-Fe₂O₃ (red iron oxide, hematite type) belongs to the trigonal crystal structure, has high thermal stability, and will not decompose at 1565℃. The material is insoluble in water and organic solvents, and exhibits stable chemical inertness to acidic and alkaline environments, which can reduce the structural or performance degradation caused by temperature and pH fluctuations in terminal applications.
High hiding power
Fe₂O₃ is a high-density inorganic pigment with strong visible light absorption ability. Its band gap is about 2.1–2.2eV, which can absorb green and blue band light, thereby reflecting red light and showing red color. The industrial particle size control is often below 1μm, with strong adaptability, easy to disperse evenly in aqueous or solvent systems, and not easy to agglomerate. Therefore, generally, a dosage of less than 5wt% can achieve a good covering effect, reduce material costs, and improve coating consistency.
Quasimagnetism
Fe₂O₃ has two crystal forms: α (diamagnetic/paramagnetic) and γ (magnetic red iron oxide). Among them, γ-Fe₂O₃ is a spin crystal with ferromagnetism. The saturation magnetization intensity of its nanoparticles can reach 30–55emu/g, and the Curie temperature is high. It is suitable for magnetic coatings, recording materials or electronic components.
Safety
Iron Oxide Red is a non-toxic, odorless powder that does not contain volatile organic compounds or harmful heavy metals. It can only be dissolved in inorganic acids in small amounts, and there is no risk of environmental and human exposure. It uses 25kg polyethylene inner bags + plastic woven bags for outer packaging, which is suitable for bulk stacking and transportation. Due to physical stability and chemical inertness, it can maintain performance for a long time without special storage.
1.Chemical Name：Iron Oxide Red
2.Molecular Formula: Fe2O3
3.Molecular Weight: 159.688
4.CAS: 1309-37-1
5. Character: Red to reddish brown powder odorless insoluble in water organic acids and organic solvents soluble in inorganic acids have α- type (positive magnetic) and γ- type (diamagnetic) two types of dry production of products generally fineness in 1μm below the photothermal air stability of acid and base is more stable coloring force.
6. Usage: Used for polishing magnetic materials, grinding materials, coatings and printing ink industry.
7. Packing: It is packed with polythene bag as the inner layer, and a compound plastic woven bag as the outer layer. The net weight of each bag is 25kg.
8. Storage and Transport: It should be stored in a dry and ventilative warehouse, kept away from water and moisture during transport, unloaded with care as to avoid being damaged. Furthermore, it must be stored separately from poisonous substances.
FAQ
Q: What are the chemical composition and safety of Iron Oxide Red?
A: The main ingredient is ferric oxide (Fe₂O₃), which is non-toxic, odorless, chemically stable, and meets the safety standards for use in many industries such as industry, construction, and cosmetics.
Q: What is the appearance and physical properties of the product?
A: It is a fine red to reddish brown powder, insoluble in water, high density, excellent hiding power and dispersibility, and bright color.
Q: Why does Iron Oxide Red have excellent light resistance?
A: Its structure is stable, highly resistant to ultraviolet rays and sunlight, and does not fade after long-term exposure to the outdoors. It is a high-quality inorganic red pigment.
Q: What are the advantages when applied to building materials?
A: It can evenly color concrete, bricks and tiles, floors, etc., improve decorativeness and durability, and does not affect the physical properties of substrates such as cement.
Q: Can it be used for plastics and rubber?
A: It is suitable for a variety of polymer systems, does not migrate or bleed, and can effectively color plastic particles, rubber products, PVC and other materials.
Q: How does it perform in coatings and inks?
A: It has good tinting strength and corrosion resistance, and can be used in water-based coatings, solvent-based coatings, powder coatings, and printing inks.
Q: Can it be used in ceramics and glass products?
A: It can withstand high-temperature firing, and its color is stable in ceramic glazes and glass coloring, without fading or decomposition reactions.
Q: Can it be used in cosmetics or pharmaceuticals?
A: It can be used as CI 77491 for cosmetic colorants, such as lipstick and blush, and can also be used for tablet coating and food-grade excipients, in compliance with relevant regulations.
Q: Does it have magnetic uses?
A: It is a weakly magnetic or diamagnetic material. Although it is not a main magnetic material, it still has auxiliary applications in some electrical fields.
Q: Can it be used as a polishing material?
A: High-purity fine powder is often used to make polishing red powder (jeweler's rouge), which is suitable for polishing precision metals, glass and gemstones.
Q: What is the thermal stability?
A: The melting point is as high as 1565°C, which is suitable for use in high-temperature environments, with a low risk of thermal decomposition, and is suitable for high-temperature coatings and ceramic processes.
Q: Is it stable under acid and alkali conditions?
A: It is stable to weak acids and weak bases, but is prone to react in strong acids (such as hydrochloric acid). It is recommended to use it with caution under extreme conditions.
Q: Is the product environmentally friendly?
A: It complies with international environmental regulations such as ROHS and REACH, does not contain heavy metals or harmful solvents, and is an environmentally friendly inorganic pigment.
Q: What industries are the products suitable for?
A: It is widely used in construction materials, paints and coatings, plastics and rubber, ceramics and glass, printing inks, cosmetics, pharmaceutical excipients and polishing materials.
Q: What should be paid attention to during storage and use?
A: It should be stored in a dry and ventilated place, avoid moisture or direct sunlight, and prevent packaging damage and mixing with acid and alkali chemicals during transportation.
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