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Oxide Powder

Iron Oxide Fe2O3 CAS 1309-37-1

Item No.: TR-Fe2O3
Iron oxide, chemical formula Fe2O3. Red or dark red amorphous powder. Insoluble in water, soluble in hydrochloric acid and sulfuric acid, slightly soluble in nitric acid.
Purity: 99.5%
Particle size: 50nm, 150nm
Iron Oxide Properties

What is Iron Oxide Fe2O3 Powder ?

Iron (III), haematite, or Ferric oxide is an inorganic compound with the molecular formula Fe2O3. It is one of the three main iron oxides, and the other two are rare forms of iron oxide (II) and natural magnetite iron oxide (II, III).

Fe oxide or iron trioxide with the general formula Fe2O3 is an inorganic compound known to be one of the three main iron oxides naturally present in a mineral called magnetite. When iron oxide is used as a suspension in solutions and applications in the fields of biomedicine, agriculture, and the environment, it has unique supermagnetic properties and easy separation methods. The advantage of powdered iron oxide is that it can be modified with various inorganic and organic compounds (such as starch, polyelectrolyte, and non-ionic detergent) according to its main surface chemical potential to be used for more applications. Magnetic iron oxide is used in biomedical applications by applying an external magnetic field.

Iron oxide is a compound with ferromagnetic properties. When placed in an external magnetic field, the compound is magnetic. When obtained in a controlled size and crystal morphology, this property proves to be the desired characteristic. Iron oxide fine particles have become the focus of attention due to their low toxicity, magnetic properties, and convenient separation methods in medical diagnosis and magnetic resonance imaging (MRI). The application of iron oxide on the macro scale and its reactivity are decisive factors. Still, they exhibit spontaneous combustion when available in smaller sizes in the micron and nano scales. Iron oxide is a semiconductor material with a negative temperature efficiency of resistance.


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Performance of Iron Oxide Fe2O3 powder:

Iron oxide is red to reddish brown powder. Odorless. Insoluble in water, organic acids, and organic solvents. Soluble in inorganic acids. There are two types: α-type (positive magnetic) and γ-type (diamagnetic). The fineness of dry-produced products is generally below 1μm. Stable to light, heat, and air. It is more stable to acid and alkali. Strong coloring power. The relative density is 5.12~5.24. The lower the content, the lower the relative density. Refractive index 3.042. The melting point is 1550℃ and decomposes at about 1560℃.

Technical Parameter of Iron Oxide Fe2O3 powder:

Content Fe2O3≥﹪ 96 96
105°C volatile matter ≤﹪ 0.9 0.9
Hydrotrope ≤﹪ 0.25 0.25
Water-soluble chloride and sulfate≤﹪ 0.18 0.18
Residue on sieve (10um)mesh 0.45 0.45
Water suspension PH value 5.0-7.0 5.0-7.0
Oil absorption (ml/100g) 20 20
Colour(as compared with the sample)  Micro- Micro-
Tinting strength ﹪ 99 99

How is Iron Oxide Fe2O3 Powder produced?

There are wet and dry methods for preparing Iron Oxide Fe2O3. Wet-process products have fine crystals and soft particles that are easy to grind and use as pigments. Dry-process products have large crystals and hard particles, suitable for magnetic, polishing, and abrasive materials.

1. Wet method

Quickly react a certain amount of 5% ferrous sulfate solution with excess sodium hydroxide solution (the alkali excess is required to be 0.04~0.08g/mL), and pass in the air at room temperature to make it all become reddish-brown ferric hydroxide colloidal solution, As the nucleus of deposited iron oxide. Take the crystal nucleus as the carrier, use ferrous sulfate as the medium, and pass it in the air. At 75~85℃, in the presence of metallic iron, the ferrous sulfate reacts with oxygen in the air to form iron oxide (i.e., iron red) and deposits on the crystal nucleus. The sulfate radicals in the solution react with the metallic iron to regenerate ferrous sulfate, and the ferrous sulfate is oxidized to iron red by air to continue to deposit so that the circulation to the end of the process will generate red iron oxide.

2. Dry method

Nitric acid reacts with iron to form ferrous nitrate, which is cooled and crystallized, dehydrated and dried, then ground and calcined at 600-700°C for 8-10 hours, washed with water, dried, and pulverized to obtain iron oxide red product. Iron oxide yellow can also be used as a raw material to obtain red iron oxide after calcination at 600~700℃.


Applications of Iron Oxide Fe2O3 Powder:

1. Iron industry

The overwhelming application of iron(III) oxide is as the feedstock of the steel and iron industries, e.g. the production of iron, steel, and many alloys.

2. Polishing

A very fine ferric oxide powder is known as "jeweler's rouge," "red rouge," or simply rouge. It is used to put the final polish on metallic jewelry and lenses and, historically, as a cosmetic. Rouge cuts more slowly than some modern polishes, such as cerium(IV) oxide, but it is still used in optics fabrication and by jewelers for its superior finish. When polishing gold, the rouge slightly stains the gold, contributing to the finished piece's appearance. Rouge is sold as a powder, paste, laced on polishing cloths, or solid bar (with a wax or grease binder). Other polishing compounds are often called "rouge," even when they do not contain iron oxide. Jewelers remove the residual rouge on jewelry by use of ultrasonic cleaning. Products sold as "stropping compounds" are often applied to a leather strop to assist in getting a razor edge on knives, straight razors, or any other edged tool.

3. Iron oxide pigments

Two different colors at different hydrate phases (α = red, β = yellow) of iron(III) oxide hydrate are useful as pigments.

Iron(III) oxide is also used as a pigment under the names "Pigment Brown 6", "Pigment Brown 7", and "Pigment Red 101". Some of them, e.g., Pigment Red 101 and Pigment Brown 6, are approved by the US Food and Drug Administration (FDA) for use in cosmetics. Iron oxides are used as pigments in dental composites alongside titanium oxides. Hematite is the characteristic component of the Swedish paint color Falu red.

4. Magnetic recording

Iron(III) oxide was the most common magnetic particle used in all types of magnetic storage and recording media, including magnetic disks (for data storage) and magnetic tape (used in audio and video recording as well as data storage). Cobalt alloy superseded its use in computer disks, enabling thinner magnetic films with higher storage density.

5. Photocatalysis

α-Fe2O3 has been studied as a photoanode for solar water oxidation. However, its efficacy is limited by a short diffusion length (2-4 nm) of photo-excited charge carriers and subsequent fast recombination, requiring a large overpotential to drive the reaction. Research has focused on improving the water oxidation performance of Fe2O3 using nanostructuring, surface functionalization, or alternate crystal phases such as β-Fe2O3.

6. Medicine

Calamine lotion, used to treat mild itchiness, is composed of zinc oxide, acting as an astringent, and about 0.5% iron(III) oxide, the product's active ingredient, acting as an antipruritic. The red color of iron(III) oxide is also mainly responsible for the lotion's pink color.

Storage Condition of Iron Oxide Fe2O3 powder:

Iron Oxide Fe2O3 powder should be stored in dry, cool and sealing of the environment, can not be exposure to air, in addition should avoid the heavy pressure, according to ordinary goods transportation.

Packing & Shipping of Cerium Oxide Fe2O3 powder:
It is packed in double plastic bags inside, which can be filled with argon in a vacuum; it can be vacuumed and filled with argon for protection.
Iron Oxide Fe2O3 powder packing: vacuum packing, 100g, 500g or 1kg/bag, 25kg/barrel, or as your request.
Iron Oxide Fe2O3 powder shipping: could be shipped out by sea , by air, by express as soon as possible once payment receipt.

Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and Nanomaterials, including boride powder, nitride powder, graphite powder, sulfide powder, 3D printing powder, etc.
If you are looking for high-quality Iron oxide powder, please feel free to contact us and send an inquiry. ([email protected])

Iron Oxide Properties

Other Names ferric oxide, red iron oxide, micaceous iron oxide, Fe2O3 powder
CAS No. 1309-37-1
Compound Formula Fe2O3
Molecular Weight 159.69
Appearance Reddish-brown Powder
Melting Point 1566 °C
Boiling Point N/A
Density N/A
Solubility in H2O Insoluble
Exact Mass 159.855 g/mol

Iron Oxide Health & Safety Information

Signal Word N/A
Hazard Statements N/A
Hazard Codes N/A
Risk Codes N/A
Safety Statements N/A
Transport Information NONH
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