Iron oxide pigments are a class of inorganic pigments primarily composed of iron oxides (Fe₂O₃ , FeOOH, Fe₃O₄). They are widely used in industries such as construction, coatings, plastics, ceramics, paper, and rubber due to their excellent chemical stability, weather resistance, non-toxicity, and diverse color range, making them one of the most commonly used industrial pigments.
|
Items |
Standard |
|
△L* |
±0.70 |
|
△a* |
±0.70 |
|
△b* |
±0.70 |
|
Tinting Strength % |
95- 105 |
|
Iron Content % (m/m) > |
≥95 |
|
Density g/cm³ > |
≥1.5 |
|
Moisture % ≤ |
≤0.3 |
|
Volatile Matter at 105°C, % (m/m) ≤ |
≤1.5 |
|
Water soluble Matter, % (m/m) ≤ |
≤0.5 |
|
Residue on Sieve (63 μm mesh), % (m/m) ≤ |
≤0.5 |
|
pH Value of Aqueous Suspension ≤ |
5-7 |
|
Oil Absorption, g/100g ≤ |
15-25 |
|
Firing Temperature °C |
- |
|
Color (Compared to Standard Sample) |
Approximate to standard |
|
Shape (Compared to Standard Sample) |
Plant Standards |
|
Water-soluble Chlorides and Sulfates, % (m/m) ≤ |
≤0.3 |
Main Types
Iron oxide pigments can be classified based on the oxidation state of iron and crystal structure:
Iron Oxide Red (Fe₂O₃):
Red or reddish-brown, composed of ferric iron (Fe³⁺), with an α-type (hematite) or γ-type (maghemite) crystal structure.
High heat resistance (up to 1200°C), lightfast, and resistance to acids and alkalis. Commonly used in construction materials, coatings, and plastics.
Iron Oxide Yellow (FeOOH):
Yellow, chemically α-FeOOH (goethite). Dehydrates to iron oxide red when heated above 200°C.
Bright color but lower heat resistance, mainly used in ambient-temperature coatings and building materials.
Iron Oxide Black (Fe₃O₄):
Black or gray-black, composed of magnetite (mixed Fe²⁺ and Fe³⁺). Exhibits conductivity and magnetism, used in magnetic materials, electronics, and as a black pigment.
Iron Oxide Brown:
Typically, a blend of iron oxide red, yellow, and black, or produced by calcining iron oxide yellow ("calcined brown").
Iron Oxide Orange/Green/Blue:
Produced through specialized processes or by combining with other metal oxides;
Do you need any help?
Our team is ready to answer any questions you may have regarding our products and services.
CONTACT
