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High thermal stability up to 800 °C, ensuring color retention in high-temperature processing.
Excellent lightfastness and weather resistance, maintaining consistent hue under prolonged UV exposure.
Non-toxic and heavy-metal-free formulation compliant with global regulatory standards (EN 71-3, RoHS).
Optimized particle size distribution for superior dispersion and tinting strength in diverse binders.
Low oil absorption (< 25 g/100g), enabling high pigment loading with improved rheology control.
Architectural coatings and exterior masonry paints requiring durable earth-tone coloration.
Ceramic glazes and clay-based tiles for consistent fired color development.
Plastic colorants for outdoor applications including PP, HDPE, and engineering thermoplastics.
Concrete admixtures and precast concrete products for permanent, alkali-stable shading.
Industrial maintenance coatings for infrastructure and metal structures exposed to harsh environments.
| Chemical Type | Naturally derived iron oxide (Fe₂O₃) with controlled calcination |
| Product Form | Fine dry powder |
| Appearance | Uniform reddish-brown granular powder |
| Primary Applications | Coatings, plastics, ceramics, concrete, inks |
| Key Features | Heat stable, lightfast, non-volatile, chemically inert |
| Benefits | Color consistency, low migration, excellent opacity |
| 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 502BU?
A: Cathay Hoover 502BU is a synthetic inorganic pigment based on iron oxide–manganese oxide complex, engineered to deliver consistent burnt umber hue and high thermal stability. It contains no organic dyes or heavy-metal additives such as lead, cadmium, or chromium(VI).
Q2: Is 502BU suitable for high-temperature applications like ceramic glazes or engineering plastics?
A: Yes — 502BU exhibits excellent thermal stability and retains its color integrity up to approximately 1000°C in oxidizing atmospheres, making it well-suited for ceramic colorants, refractory coatings, and heat-stable polymer systems including polyamide and polyphenylene sulfide.
Q3: How does 502BU compare to natural burnt umber in terms of batch-to-batch consistency and tinting strength?
A: As a synthetic inorganic pigment, 502BU offers significantly higher lot-to-lot reproducibility and stronger tinting power than natural earth pigments, with tighter control over particle size distribution and oxide phase composition.
Q4: Can 502BU be used in water-based architectural coatings without dispersion additives?
A: While 502BU is inherently hydrophobic due to its inorganic oxide surface, it can be effectively dispersed in water-based systems using standard anionic or nonionic dispersants — pre-treatment or mill-base formulation is recommended for optimal stability and gloss retention.
Q5: What safety and handling precautions should be observed during industrial processing?
A: Standard occupational hygiene practices apply: use local exhaust ventilation and wear appropriate PPE (e.g., N95 respirator, gloves, safety goggles) to minimize inhalation or skin contact with dry powder. The pigment is not classified as hazardous under GHS for acute toxicity, but dust generation should be controlled per general industrial hygiene guidelines.
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