Iron Oxide Green
Iron Oxide Green
Iron oxide green is a composite inorganic pigment, typically composed ofMixed Ferric Hydroxide Yellow (FeOOH) and Ferric Hexacyanoferrate Blue (Fe₄[Fe(CN)₆]₃)Manufactured, or viaIron Oxide Black (Fe₃O₄) and Chrome Green (Cr₂O₃) CompositeManufactured. It boasts excellent weather resistance, chemical resistance, and environmental friendliness, suitable for construction materials, coatings, plastics, and other fields.
Basic Features
Chemical Composition：
Mixed type: FeOOH (yellow) + Fe₄[Fe(CN)₆]₃ (blue) → Green
Composite: Fe₃O₄ (Black) + Cr₂O₃ (Chrome Green) → Dark Green
Color：
Light green (with a yellow tint), medium green, dark green (with a blue or black tint).
Stability：
LightfastnessSuperior (superior to organic green pigments).
Thermal resistanceTypically withstand temperatures of 300~500°C (depending on the formula).
Acid and alkali resistanceResistant to weak acids and bases; strong acids and bases may affect color.
Environmental friendlinessNon-toxic (chrome-free); note environmental standards for models containing trace amounts of chrome green.
ShapeFine powder, easily dispersible.
2. Preparation Method
Physical blending method
TranslateIron Oxide YellowAndIron Oxide BlueMixed and ground in proportion, resulting in a green hue.
Advantages: Simple process, low cost.
Disadvantages: Temperature resistance limited by ferric oxide blue (<200°C).
(2) Chemical Co-precipitation Method
Through the co-precipitation of iron salts and chromium salts, calcined to formIron-Chromium-Green (Fe-Cr-O)。
Advantages: Higher temperature resistance (up to 500°C), better stability.
(3) Coating Modification Method
Silica, aluminum oxides, and other oxides are coated on the surface of iron oxide particles to enhance weather resistance and dispersibility.
3. Main Applications
Building Materials：
Color cement, tiles, artificial turf, roof tiles.
Paints & Coatings：
Exterior wall coatings, industrial anti-corrosion paints (high weather resistance).
Plastic & Rubber：
Suitable for PVC, PE, and rubber products (such as toys, piping).
Ceramics & Glass：
Glaze, colored glass (high-temperature resistant models required).
Other：
Camouflage paint, artistic pigments, cosmetics (high purity).
4. Categories and Models
| Type | Ingredients | Features | Applicable Fields |
|---|---|---|---|
| Iron Yellow + Iron Blue Mixed | FeOOH + Fe₄[Fe(CN)₆]₃ | Low cost, but poor temperature resistance | Paints, plastics (low temperature) |
| Iron chromate green | Fe₂O₃ + Cr₂O₃ | High-temperature and corrosion-resistant | Ceramic Coating |
| Chrome-Free Iron Green | Fe₃O₄ + other stabilizers | Eco-friendly, but darker in color | Building materials, toys |
Common International Models：
PG17Green Pigment 17, Chromium Ferric Green
Chrome-Free Green(Eco-friendly, compliant with RoHS/REACH)
5. Comparison with Other Green Pigments
| Features | Iron Oxide Green | Chrome Green (Cr₂O₃) | Phthalocyanine Green (PG7) |
|---|---|---|---|
| Chemical Composition | Fe-Cr-O / Iron-based | Cr₂O₃ | Copper phthalocyanine derivatives |
| Color | Olive green, dark green | Deep Green | Vivid blue-green |
| Thermal resistance | 300~500°C | 1000°C+ | 200~300°C |
| Lightfastness | Outstanding | Superior | Superior |
| Environmental friendliness | Partially Chrome-Plated | Chromium (Hexavalent Chromium Risk) | Non-toxic |
| Cost | Mid to Low | Please provide the Chinese content that you would like to be translated into American English. | Medium to High |
Advantages and Disadvantages of Iron Oxide Green：
✅ Advantages：
High durability, suitable for outdoor use.
More stable than organic green pigments (such as phthalocyanine green may decompose under high temperatures).
Some models can be made without heavy metals, complying with environmental regulations.
❌ Shortcomings：
The color is not as vibrant as Phthalo green (suitable for matte, natural tones).
Chrome-containing models require attention to environmental compliance (e.g., EU REACH).
6. Important Notes
Temperature LimitMix type (yellow iron + blue iron) has poor temperature resistance; avoid using in high-temperature plastics (such as PP, ABS injection molding).
DispersiveEnsure thorough grinding in paints and plastics to prevent agglomeration.
Environmental ComplianceExport products must be tested for heavy metals (such as Cr⁶⁺, Pb, Cd).
Summary
Iron oxide green is a highly stable, excellent weather-resistant inorganic green pigment, suitable for the building materials, coatings, and plastics industries. For a bright green color, considerPhthalocyanine GreenAvailable for high-temperature resistance.Chrome GreenOrIron-chromium composite greenChoose specifically based on the application scenario (temperature resistance, environmental requirements)!
