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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 (e.g., EN 71-3, RoHS).
Optimized particle size distribution for superior dispersion and tinting strength in diverse binders.
Low oil absorption (< 25 g/100 g), enabling efficient incorporation and reduced binder demand in formulations.
Architectural and industrial coatings requiring durable earth-tone pigmentation.
Ceramic glazes and clay-based bodies for kiln-fired decorative and functional ware.
Concrete admixtures and precast concrete products for consistent, fade-resistant coloring.
Plastic compounds including PVC, polyolefins, and engineering thermoplastics for outdoor applications.
Printing inks for packaging and security documents where chemical and light stability are critical.
| Chemical Type | Natural iron oxide (Fe₂O₃–MnO complex) |
| Product Form | Fine dry powder |
| Appearance | Dark reddish-brown granular powder |
| Primary Applications | Coatings, ceramics, concrete, plastics, inks |
| Key Features | Heat stable, lightfast, non-toxic, low oil absorption |
| Benefits | Consistent batch-to-batch color, easy dispersion, regulatory compliance |
| Storage Conditions | Store in cool, dry, well-ventilated area away from moisture |
| Shelf Life | 36 months under recommended storage conditions |
Q1: What is the primary chemical composition of Cathay Hoover 524BU?
A: Cathay Hoover 524BU is an iron oxide-based inorganic pigment, primarily composed of hydrated iron oxides and manganese-modified iron oxides, delivering its characteristic burnt umber hue through controlled calcination.
Q2: Is 524BU suitable for use in exterior architectural coatings?
A: Yes — as a high-performance inorganic pigment, 524BU offers excellent lightfastness, thermal stability, and resistance to weathering, making it well-suited for long-term durability in exterior wall paints, stucco, and concrete colorants.
Q3: How does 524BU compare to organic brown pigments in terms of heat stability?
A: Unlike many organic brown pigments, 524BU exhibits superior thermal stability and can withstand processing temperatures commonly encountered in plastics compounding and ceramic glaze firing without significant hue shift or decomposition.
Q4: Can 524BU be used in water-based systems without dispersion additives?
A: While 524BU is inherently compatible with aqueous media, optimal color development and stability in water-based paints or inks typically require standard dispersants and pH control — it is not self-dispersing.
Q5: What is the typical dosage range for achieving full opacity in architectural coatings?
A: Dosage depends on substrate, desired shade depth, and formulation matrix, but 524BU is generally effective at low concentrations — typically ranging from 0.1% to 2% by weight in finished coating systems.
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