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High thermal stability up to 800°C, ensuring color integrity in high-temperature processing.
Excellent lightfastness and weather resistance, maintaining hue and opacity under prolonged UV exposure.
Non-toxic, heavy-metal-free formulation compliant with global regulatory standards including EN 71-3 and RoHS.
Consistent particle size distribution for optimal dispersion and uniform color development in diverse media.
Superior tinting strength and hiding power compared to conventional iron oxide pigments.
Architectural coatings and exterior wall paints requiring long-term color retention.
Ceramic glazes and underglaze decorations fired at medium-to-high temperatures.
Plastic coloration for automotive interior components and durable consumer goods.
Concrete and cement-based products including terrazzo, pavers, and precast elements.
Industrial powder coatings demanding thermal stability and chemical inertness.
| Chemical Type | Iron oxide (α-Fe₂O₃) based inorganic pigment |
| Product Form | Free-flowing dry powder |
| Appearance | Uniform burnt sienna red-brown granular powder |
| Primary Applications | Coatings, plastics, ceramics, construction materials |
| Key Features | Heat stable, lightfast, non-toxic, chemically inert |
| Benefits | Low migration, excellent dispersibility, consistent batch-to-batch performance |
| pH Value (5% aqueous slurry) | 6.5 – 7.5 |
| Volatile Content (105°C, 2 hrs) | ≤ 0.5 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 304BS?
A: Cathay Hoover 304BS is an iron oxide-based inorganic pigment, primarily composed of thermally stabilized α-Fe₂O₃ (hematite), with minor controlled impurities consistent with high-purity burnt sienna grades.
Q2: Is this pigment suitable for use in exterior architectural coatings?
A: Yes — 304BS exhibits excellent UV stability, weather resistance, and alkali resistance, making it well-suited for long-term performance in exterior acrylic, silicate, and cementitious architectural coatings.
Q3: How does 304BS compare to organic red-brown pigments in terms of heat stability?
A: As an inorganic iron oxide, 304BS maintains its color integrity at temperatures exceeding 800 °C, significantly outperforming most organic pigments, which typically begin degrading above 200 °C.
Q4: Can 304BS be used in waterborne systems without dispersion additives?
A: While 304BS is inherently compatible with aqueous media, optimal color development and stability in waterborne systems generally require standard dispersants or surfactants tailored to iron oxide pigments.
Q5: What is the typical dosage range for achieving full opacity in industrial paint formulations?
A: Dosage depends on formulation requirements and desired chroma, but 304BS is typically used at low concentrations — generally ranging from 0.1% to 2% by weight — to achieve strong tinting strength and good hiding power.
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