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High thermal stability up to 800°C, ensuring color retention 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 (RoHS, REACH).
Consistent particle size distribution for uniform dispersion and optimal tinting strength.
Low oil absorption (< 22 g/100g), enabling high pigment loading and improved formulation efficiency.
Architectural and industrial coatings requiring durable earth-tone pigmentation.
Ceramic glazes and underglaze decorations fired at medium-to-high temperatures.
Concrete and cement-based products including precast elements and terrazzo flooring.
Plastic masterbatches for automotive interior components and construction profiles.
Oil-based and water-based printing inks for packaging and decorative applications.
| Chemical Type | Iron oxide-based inorganic pigment (Fe₂O₃–MnO–Al₂O₃ complex) |
| Product Form | Fine dry powder |
| Appearance | Uniform reddish-brown granular powder |
| Primary Applications | Coatings, ceramics, concrete, plastics, inks |
| Key Features | Heat stable, UV resistant, chemically inert, non-volatile |
| Benefits | Color consistency, low migration, excellent opacity and hiding power |
| pH (10% aqueous slurry) | 6.5 – 7.5 |
| Volatile Matter (105°C, 2 hrs) | ≤ 0.5% |
Q1: What is the primary chemical composition of Cathay Hoover 518BU?
A: Cathay Hoover 518BU is an iron oxide-based inorganic pigment, primarily composed of calcined iron oxides and hydroxides, with trace natural mineral impurities consistent with high-purity burnt umber grades. It contains no added heavy metals or organic dyes.
Q2: Is 518BU suitable for use in exterior architectural coatings?
A: Yes — 518BU exhibits excellent lightfastness, weather resistance, and alkali stability, making it well-suited for exterior masonry, stucco, and cementitious coatings where long-term color retention and UV resistance are required.
Q3: How does 518BU compare to synthetic iron oxide pigments in terms of tinting strength and dispersion?
A: As a naturally derived, thermally processed umber, 518BU offers moderate tinting strength and good dispersibility in aqueous and solvent-based systems. Its particle morphology supports stable suspension, though it typically requires less grinding effort than some ultra-fine synthetics.
Q4: Can 518BU be used in food-contact coatings or toys?
A: While 518BU complies with general industrial safety and handling guidelines for inorganic pigments, it is not certified for direct food-contact applications or regulated toy materials. Customers requiring such compliance must conduct full regulatory validation per their target market requirements.
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