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High thermal stability up to 800 °C, ensuring color integrity during 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 superior dispersion and uniform color development in diverse binders.
Low oil absorption (< 25 g/100g) enabling high loading capacity and improved formulation efficiency.
Architectural and industrial coatings requiring durable earth-tone pigmentation.
Ceramic glazes and clay-based bodies for consistent firing performance and natural sienna shade.
Plastic coloration for outdoor applications including PP, HDPE, and engineering thermoplastics.
Cementitious systems such as concrete pavers, stucco, and decorative mortars.
Artist-grade acrylics, oils, and watercolor pigments where archival stability and non-reactivity are critical.
| Chemical Type | Iron oxide hydroxide (α-FeOOH) based inorganic pigment |
| Product Form | Free-flowing dry powder |
| Appearance | Uniform yellowish-brown granular powder |
| Primary Applications | Coatings, plastics, ceramics, construction materials, artist pigments |
| Key Features | Heat stable, lightfast, non-toxic, low oil absorption, pH stable (4–10) |
| Particle Size (D50) | 0.8–1.2 µm |
| Bulk Density | 0.9–1.1 g/cm³ |
| VOC Content | Non-applicable (zero-VOC solid pigment) |
Q1: What is the primary chemical composition of Cathay Hoover 202RS Raw Sienna?
A: Cathay Hoover 202RS is an iron oxide-based inorganic pigment, primarily composed of hydrated iron oxide (Fe₂O₃·nH₂O), with natural earth-derived mineral impurities contributing to its characteristic warm, earthy tone and inherent stability.
Q2: Is 202RS suitable for use in exterior architectural coatings?
A: Yes — as a naturally weather-resistant iron oxide pigment, 202RS exhibits excellent UV stability, alkali resistance, and thermal durability, making it well-suited for long-term performance in exterior masonry, stucco, and cementitious coatings.
Q3: How does 202RS differ from synthetic iron oxides or burnt sienna variants?
A: Unlike synthetic iron oxides, 202RS retains the subtle hue variation and soft chroma of natural earth pigments due to its geological origin and minimal processing. Compared to burnt sienna, it offers a cooler, less reddish, and more neutral brown tone with higher moisture content and slightly lower tinting strength.
Q4: Can 202RS be used in water-based systems without dispersion additives?
A: While 202RS is inherently compatible with aqueous media, optimal color development and suspension stability in water-based paints or plasters typically require standard wetting and dispersing agents — especially when targeting uniform particle distribution and reduced settling.
Q5: What is the typical dosage range for achieving full opacity in cementitious applications?
A: Dosage depends on substrate porosity, desired shade depth, and cement type, but 202RS is generally effective at concentrations ranging from 0.1% to 2% by weight of the dry binder — with most architectural precast and render formulations falling between 0.5% and 1.5%.
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