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High thermal stability up to 800°C, ensuring color integrity in high-temperature processing.
Excellent lightfastness and weather resistance, suitable for exterior architectural coatings.
Non-toxic, heavy-metal-free formulation compliant with global environmental regulations (REACH, RoHS).
Consistent particle size distribution for optimal dispersion and tinting strength in diverse binders.
Low oil absorption for improved mill base efficiency and enhanced pigment loading capacity.
Architectural and industrial protective coatings.
Cement-based products including concrete pavers, stucco, and terrazzo.
Plastics requiring heat-stable earth-tone pigmentation (e.g., outdoor furniture, construction profiles).
Ceramic glazes and underglaze colorants for architectural tiles.
Artist-grade acrylics and alkyd paints demanding archival permanence.
| Chemical Type | Iron oxide-based inorganic pigment (α-Fe₂O₃ modified) |
| Product Form | Free-flowing dry powder |
| Appearance | Uniform reddish-brown granular powder |
| Primary Applications | Coatings, construction materials, plastics, ceramics, artists’ colors |
| Key Features | Heat stable, lightfast, chemically inert, non-bleeding |
| Benefits | Color consistency, low volatility, compatibility with water- and solvent-based systems |
| pH (10% aqueous suspension) | 6.5 – 7.5 |
| Volatile Matter (105°C, 2 hrs) | ≤ 0.5 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 320BS?
A: Cathay Hoover 320BS 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 — 320BS exhibits excellent lightfastness, weather resistance, and alkali stability, making it well-suited for exterior applications including masonry paints, stucco systems, and cementitious renders.
Q3: How does 320BS compare to organic red-brown pigments in terms of heat stability?
A: As an inorganic iron oxide, 320BS maintains its color integrity at temperatures exceeding 800 °C, significantly outperforming most organic brown pigments, which typically begin to degrade above 200 °C.
Q4: Can 320BS be used in waterborne and solventborne systems?
A: Yes — it demonstrates good dispersibility and compatibility in both waterborne acrylics, polyvinyl acetate emulsions, and common solvent-based alkyd and epoxy systems, though optimal dispersion requires appropriate wetting and stabilization protocols.
Q5: What is the typical dosage range for achieving full opacity in architectural coatings?
A: Dosage depends on formulation requirements and desired shade intensity, but 320BS is typically used at low concentrations — generally ranging from 0.1% to 2% by weight — to achieve strong tinting strength and full hiding power.
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