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High thermal stability up to 800 °C, ensuring color integrity during high-temperature processing.
Excellent lightfastness and weather resistance, maintaining hue and opacity under prolonged UV exposure.
Non-toxic, heavy-metal-free formulation compliant with global regulatory standards including EN 71-3 and RoHS.
Consistent particle size distribution for optimal dispersion and uniform color development in diverse matrices.
Strong tinting strength and hiding power, enabling efficient pigment loading and cost-effective formulation.
Architectural and industrial coatings requiring durable earth-tone finishes.
Ceramic glazes and bodies for stoneware and porcelain firing cycles.
Concrete admixtures and precast concrete products for consistent, fade-resistant coloring.
Plastics compounding, especially for outdoor applications such as garden furniture and construction profiles.
Specialty inks for packaging and decorative printing where heat resistance and light stability are critical.
| Chemical Type | Iron oxide-based inorganic pigment (Fe₂O₃–MnO complex) |
| Product Form | Free-flowing fine powder |
| Appearance | Deep reddish-brown granular powder |
| Primary Applications | Coatings, ceramics, concrete, plastics, inks |
| Key Features | Heat stable, lightfast, chemically inert, non-volatile |
| Benefits | Low migration, excellent dispersibility, pH-stable across 4–11 |
| Specific Gravity | 3.9–4.2 g/cm³ |
| Volatile Matter (105 °C, 2 hrs) | ≤ 0.5 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 522BU?
A: Cathay Hoover 522BU is a synthetic inorganic pigment based on iron oxide–manganese oxide complex, engineered to deliver consistent burnt umber hue and enhanced thermal stability compared to natural earth pigments.
Q2: Is 522BU suitable for high-temperature applications such as ceramic glazes or engineering plastics?
A: Yes — 522BU exhibits excellent heat stability and retains its color integrity up to approximately 1000 °C in oxidizing atmospheres, making it well-suited for ceramic colorants, refractory coatings, and thermally processed polymer systems.
Q3: How does 522BU compare to natural burnt umber in terms of batch-to-batch consistency and dispersibility?
A: As a synthetic product, 522BU offers significantly higher lot-to-lot color uniformity and particle size control, resulting in more predictable dispersion behavior in both aqueous and solvent-based systems without requiring extensive surface treatment.
Q4: Can 522BU be used in food-contact or pharmaceutical-grade formulations?
A: While 522BU complies with general industrial safety and handling guidelines, it is not pre-certified for direct food contact or pharmaceutical use. Customers intending such applications must conduct full regulatory validation per their target market requirements.
Q5: What is the typical dosage range when using 522BU in architectural coatings or construction mortars?
A: Dosage depends on desired opacity and shade depth, but 522BU is typically used at low concentrations — generally ranging from 0.1% to 2% by weight in finished formulations — due to its strong tinting strength and high hiding power.
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E-mail: wangxingqiang@ericwchem.com
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