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High thermal stability up to 800°C, suitable for high-temperature ceramic and enamel applications.
Excellent lightfastness and weather resistance, maintaining color integrity under prolonged UV exposure.
Non-toxic and heavy-metal-free formulation compliant with EN 71-3 and RoHS directives.
Consistent particle size distribution ensuring uniform dispersion and optimal tinting strength.
Low oil absorption for improved pigment loading efficiency in solvent-based and water-based systems.
Ceramic glazes and underglaze decorations for tableware and architectural tiles.
High-performance architectural coatings and exterior facade paints.
Plastic coloration for automotive interior components and durable consumer goods.
Industrial powder coatings requiring heat resistance and color stability.
Artist-grade acrylics, oils, and watercolor pigments demanding archival permanence.
| Chemical Type | Iron oxide-based inorganic pigment (Fe₂O₃ modified with alumina and silica) |
| Product Form | Fine dry powder |
| Appearance | Reddish-brown free-flowing powder |
| Primary Applications | Ceramics, architectural coatings, plastics, powder coatings, artists’ colors |
| Key Features | Heat resistant, lightfast, non-toxic, low oil absorption, excellent dispersibility |
| Compliance | EN 71-3, RoHS 2015/863/EU, REACH SVHC-free |
| Bulk Density | 1.2–1.4 g/cm³ |
| pH (10% aqueous slurry) | 6.5–7.5 |
Q1: What is the primary chemical composition of Cathay Hoover 308BS?
A: Cathay Hoover 308BS is an iron oxide-based inorganic pigment, primarily composed of thermally stabilized α-Fe₂O₃ (hematite), with controlled particle morphology and surface characteristics optimized for color consistency and dispersion stability.
Q2: Is 308BS suitable for use in exterior architectural coatings?
A: Yes — as a high-purity, calcined iron oxide pigment, 308BS offers excellent UV resistance, thermal stability, and alkali tolerance, making it well-suited for durable exterior coatings, including cementitious renders, stucco, and acrylic-based facade systems.
Q3: How does 308BS differ from standard burnt sienna pigments in terms of tinting strength and undertone?
A: 308BS delivers enhanced tinting strength and a slightly warmer, more saturated red-brown undertone compared to conventional burnt siennas, due to its optimized crystallinity and narrow particle size distribution — resulting in improved color development at lower loadings.
Q4: Can 308BS be used in solvent-based industrial coatings without dispersion aids?
A: While 308BS exhibits good inherent wettability, optimal performance in solvent-based systems typically requires standard dispersants or grinding resins to achieve full deagglomeration and long-term colloidal stability — especially in high-gloss or demanding corrosion-protection formulations.
Q5: What is the typical dosage range for 308BS in polymer masterbatches?
A: Dosage depends on the target shade depth and polymer matrix, but 308BS is generally used at low concentrations — typically ranging from 0.1% to 2% by weight — to achieve consistent, heat-stable coloration in polyolefins, PVC, and engineering thermoplastics.
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