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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, heavy-metal-free formulation compliant with global regulatory standards including EN 71-3 and RoHS.
Optimized particle size distribution for superior dispersion and tinting strength in diverse binders.
Low oil absorption for efficient pigment loading and improved rheology in liquid systems.
Architectural and industrial coatings requiring durable earth-tone pigmentation.
Ceramic glazes and underglaze decorations fired at stoneware and porcelain temperatures.
Plastic coloration for outdoor applications, including PP, HDPE, and engineering thermoplastics.
Cementitious products such as colored concrete, mortar, and terrazzo flooring.
Specialty inks for packaging and decorative printing where heat resistance is critical.
| Chemical Type | Natural iron oxide (Fe₂O₃-based), calcined and purified |
| Product Form | Fine dry powder |
| Appearance | Uniform reddish-brown to dark brown free-flowing powder |
| Primary Applications | Coatings, plastics, ceramics, construction materials, inks |
| Key Features | Heat stable, lightfast, non-hazardous, low volatility |
| Benefits | Consistent batch-to-batch color, minimal dust generation, easy dispersibility |
| pH (5% aqueous slurry) | 6.5–7.5 |
| Volatile Matter (105 °C, 2 hrs) | ≤ 0.5 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 503BU?
A: Cathay Hoover 503BU is an iron oxide-based inorganic pigment, primarily composed of hydrated iron oxides and manganese-modified iron oxides, thermally processed to achieve its characteristic burnt umber hue and enhanced thermal stability.
Q2: Is 503BU suitable for high-temperature applications such as engineering plastics or ceramic glazes?
A: Yes — as a calcined inorganic pigment, 503BU exhibits excellent thermal stability and retains color integrity at processing temperatures commonly encountered in polyolefins, polyesters, and ceramic firing cycles, making it well-suited for demanding high-heat applications.
Q3: How does 503BU compare to organic brown pigments in terms of lightfastness and weather resistance?
A: Unlike many organic brown pigments, 503BU offers outstanding lightfastness, UV stability, and atmospheric resistance due to its inorganic crystalline structure — it shows negligible fading or chalking under prolonged outdoor exposure and is widely preferred for exterior-grade coatings and construction materials.
Q4: Can 503BU be used in water-based systems without dispersion additives?
A: While 503BU is inherently hydrophobic, it can be effectively incorporated into water-based paints, inks, and coatings using standard dispersing agents and high-shear mixing — pre-dispersed or surface-treated grades are recommended for optimal stability and color development in aqueous media.
Q5: What safety and regulatory considerations apply to handling and use of 503BU?
A: As a non-volatile, heavy-metal-free iron oxide pigment, 503BU is classified as low-hazard under standard industrial hygiene practices; it complies with major global pigment safety frameworks for general-purpose industrial use, though appropriate dust control and PPE are advised during dry handling.
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