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High thermal stability up to 800 °C, ensuring color retention in high-temperature processing.
Excellent lightfastness and weather resistance, suitable for long-term outdoor exposure.
Non-toxic and heavy-metal-free formulation compliant with global regulatory standards (EN 71-3, RoHS).
Consistent particle size distribution for uniform dispersion and optimal tinting strength.
Low oil absorption for improved compatibility with solvent-based and water-based systems.
Architectural coatings including exterior masonry paints and stucco finishes.
Ceramic glazes and underglaze decorations requiring stable color development during firing.
Plastic coloration for automotive interior components and construction profiles.
Cement-based products such as colored concrete, pavers, and precast elements.
Industrial powder coatings where heat resistance and UV stability are critical.
| Chemical Type | Natural earth-derived iron oxide (Fe₂O₃·H₂O) |
| Product Form | Fine dry powder |
| Appearance | Free-flowing yellowish-brown powder |
| Primary Applications | Coatings, plastics, ceramics, construction materials |
| Key Features | Non-hazardous, non-volatile, pH-stable |
| Benefits | Enhanced batch-to-batch consistency and ease of dispersion |
| Storage Conditions | Store in cool, dry place; protect from moisture and direct sunlight |
| Shelf Life | 24 months under recommended storage conditions |
Q1: What is the primary chemical composition of Cathay Hoover 208RS Raw Sienna?
A: Cathay Hoover 208RS is an iron oxide–based inorganic pigment, derived from naturally occurring hydrated iron oxides and hydroxides. Its characteristic warm brown hue arises from a stable crystalline matrix rich in α-FeOOH (goethite) and associated clay minerals, without synthetic organic chromophores or heavy metal additives.
Q2: Is this pigment suitable for use in exterior architectural coatings?
A: Yes — 208RS exhibits excellent UV stability, alkali resistance, and weatherfastness due to its fully inorganic nature and robust crystal structure. It is widely used in high-durability cementitious renders, stucco systems, and silicate-based façade paints where long-term color retention under solar exposure and moisture cycling is required.
Q3: How does 208RS differ from synthetic iron oxide reds or burnt siennas?
A: Unlike calcined (burnt) siennas, 208RS retains its natural hydration state, resulting in a softer, more earthy tone with lower tinting strength and higher opacity. Compared to synthetic iron oxide reds, it offers greater batch-to-batch consistency in natural shade variation and enhanced compatibility with mineral binders such as lime and sodium silicate.
Q4: What dispersion methods are recommended for optimal performance in waterborne systems?
A: For waterborne applications, pre-wetting with low-shear mixing followed by gradual incorporation into the millbase is recommended. Use of standard anionic or nonionic dispersants compatible with iron oxides typically achieves stable dispersion; avoid strongly acidic or chelating additives that may affect surface charge or long-term suspension stability.
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