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High thermal stability up to 800 °C, ensuring color integrity in high-temperature processing.
Excellent lightfastness and weather resistance, suitable for long-term outdoor exposure.
Non-toxic, heavy-metal-free formulation compliant with global regulatory standards including EN 71-3 and RoHS.
Consistent particle size distribution for uniform dispersion and optimal tinting strength.
Low oil absorption (18–22 g/100 g), enabling efficient pigment loading and improved rheology in binder systems.
Ceramic glazes and underglaze decorations requiring heat-stable brown hues.
Architectural coatings and façade paints exposed to UV and moisture.
Industrial powder coatings for metal substrates.
Concrete and cementitious coloring for precast and architectural concrete.
Plastic masterbatches for outdoor applications including automotive trims and construction profiles.
| Chemical Type | Natural iron oxide-based inorganic pigment (Fe₂O₃·H₂O modified) |
| Product Form | Fine dry powder |
| Appearance | Uniform reddish-brown granular powder |
| Primary Applications | Coatings, plastics, ceramics, concrete, and construction materials |
| Key Features | Heat stable, lightfast, non-bleeding, low volatility |
| Benefits | Color consistency, regulatory compliance, easy dispersion, minimal impact on polymer degradation |
| pH (10% aqueous slurry) | 6.5–7.5 |
| Volatile Matter (105 °C, 2 hrs) | ≤ 1.0 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 520BU?
A: Cathay Hoover 520BU is a synthetic iron oxide-based inorganic pigment, primarily composed of hydrated iron oxides with controlled crystal structure and surface characteristics optimized for thermal stability and dispersion performance.
Q2: Is 520BU suitable for high-temperature applications such as engineering plastics or powder coatings?
A: Yes — as a calcined inorganic oxide pigment, 520BU exhibits excellent thermal stability and retains its color integrity at processing temperatures commonly encountered in polyolefins, polyesters, and thermoset powder coatings.
Q3: How does 520BU compare to natural burnt umber in terms of consistency and batch-to-batch reproducibility?
A: Unlike natural earth pigments, 520BU is synthetically manufactured under tightly controlled conditions, delivering superior color uniformity, narrower particle size distribution, and reliable batch-to-batch performance across production runs.
Q4: What are the recommended dispersion methods for optimal color development in liquid systems?
A: For liquid coatings and inks, high-shear mixing or bead milling is recommended to achieve full deagglomeration. Pre-wetting with compatible solvents or dispersants enhances stabilization and minimizes flocculation.
Q5: Can 520BU be used in food-contact or pharmaceutical packaging materials?
A: While 520BU complies with general industrial safety and handling guidelines, its suitability for regulated applications depends on final formulation compliance and end-use regulatory approval — users must conduct their own due diligence per applicable regional requirements.
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