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High thermal stability up to 600°C, ensuring color integrity during high-temperature processing.
Excellent lightfastness and weather resistance, minimizing fading under prolonged UV exposure.
Low oil absorption (<35 g/100g), enabling efficient dispersion in resin and binder systems.
Non-toxic and heavy metal-free formulation compliant with EN 71-3 and RoHS directives.
Consistent particle size distribution for uniform tinting strength and optimal hiding power.
Architectural coatings and exterior wall paints requiring durable earth-tone coloration.
Industrial maintenance coatings for steel structures and infrastructure projects.
Plastic coloration for outdoor applications including garden furniture and construction profiles.
Ceramic glazes and underglaze decorations where heat stability is critical.
Concrete admixtures and precast concrete products for consistent, fade-resistant shading.
| Chemical Type | Natural iron oxide-based (Fe₂O₃–MnO complex) |
| Product Form | Fine dry powder |
| Appearance | Uniform reddish-brown granular powder |
| Primary Applications | Coatings, plastics, concrete, ceramics |
| Key Features | Heat stable, lightfast, non-bleeding, dispersible |
| Benefits | Color consistency, low VOC impact, regulatory compliance |
| pH (10% aqueous slurry) | 6.5–7.5 |
| Volatile Matter (105°C, 2h) | ≤1.0 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 508BU?
A: Cathay Hoover 508BU is an iron oxide-based inorganic pigment, primarily composed of calcined iron oxides and hydroxides, with trace amounts of naturally occurring alumina and silica contributing to its thermal stability and color consistency.
Q2: Is 508BU suitable for use in high-temperature applications such as ceramic glazes or refractory coatings?
A: Yes — as a thermally stable inorganic pigment, 508BU retains its color integrity and structural integrity at elevated processing temperatures, making it well-suited for ceramic colorants, vitreous enamels, and heat-resistant industrial coatings.
Q3: How does 508BU compare to organic burnt umber alternatives in terms of lightfastness and weather resistance?
A: Unlike organic counterparts, 508BU exhibits excellent inherent lightfastness, UV stability, and atmospheric resistance due to its inorganic crystalline structure — it shows negligible fading or chalking under prolonged outdoor exposure or intense artificial lighting.
Q4: Can 508BU be dispersed effectively in both water-based and solvent-based systems?
A: Yes — with appropriate surface treatment and standard dispersion techniques (e.g., high-shear mixing or bead milling), 508BU achieves stable, uniform dispersion across aqueous emulsions, alkyd resins, epoxy systems, and polyurethane coatings.
Q5: What safety and handling precautions are recommended during industrial processing?
A: As a fine inorganic powder, general industrial hygiene practices apply: use local exhaust ventilation, avoid inhalation of dust, and wear appropriate PPE (e.g., N95 respirator, gloves, safety goggles); it is non-toxic but should not be ingested or allowed to contact eyes or broken skin.
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E-mail: wangxingqiang@ericwchem.com
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