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Naturally derived iron oxide-based pigment with consistent earthy brown hue and excellent batch-to-batch color reproducibility.
High thermal stability up to 350°C, enabling safe use in high-temperature processing such as powder coating curing and ceramic glaze firing.
Low oil absorption (18–22 g/100g), supporting efficient dispersion and improved rheology in solvent-based and water-based systems.
Non-toxic, heavy metal-free formulation compliant with EN 71-3 and RoHS directives for consumer-facing applications.
Excellent lightfastness (ASTM Level 8) and weather resistance, ensuring long-term color retention in exterior coatings and architectural finishes.
Architectural and industrial coatings, including exterior wall paints and protective primers.
Ceramic glazes and underglaze decorations for tiles and sanitaryware.
Concrete and cement-based products, such as colored paving stones and precast elements.
Plastic masterbatches for construction profiles, garden furniture, and outdoor packaging.
Printing inks for packaging and labeling requiring natural tone and regulatory compliance.
| Chemical Type | Natural iron oxide (Fe₂O₃·H₂O) with clay mineral matrix |
| Product Form | Fine dry powder |
| Appearance | Free-flowing, reddish-brown to olive-brown granular powder |
| Primary Applications | Coatings, ceramics, concrete, plastics, inks |
| Key Features | Lightfast, weather-resistant, thermally stable, non-hazardous |
| Benefits | Color consistency, easy dispersion, regulatory compliance, cost-effective natural alternative |
| pH (5% aqueous suspension) | 6.5–7.5 |
| Volatile Matter (105°C, 2 hrs) | ≤5.0 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 414RU Raw Umber?
A: Cathay Hoover 414RU is a naturally derived, iron oxide–based inorganic pigment, primarily composed of hydrated iron oxide (Fe₂O₃·nH₂O) with naturally occurring manganese and clay mineral impurities that contribute to its characteristic earthy brown hue and inherent stability.
Q2: Is 414RU suitable for use in exterior architectural coatings?
A: Yes — as a natural earth pigment, 414RU exhibits excellent lightfastness, thermal stability, and resistance to weathering, making it well-suited for exterior applications such as masonry paints, stucco, and concrete stains where long-term color retention under UV exposure and moisture cycling is required.
Q3: How does 414RU compare to synthetic iron oxides in terms of tinting strength and dispersion behavior?
A: Compared to synthetic iron oxides, 414RU has lower tinting strength and a broader particle size distribution, resulting in softer, more muted coloration and slightly higher demand for wetting and stabilization during dispersion. It typically requires moderate shear energy and compatible dispersants for optimal integration into aqueous or solvent-based systems.
Q4: Can 414RU be used in food-contact or pharmaceutical applications?
A: No — Cathay Hoover 414RU is not certified for direct food-contact, pharmaceutical, or cosmetic use. It is formulated and tested for industrial coating, construction, and general-purpose pigment applications, and does not meet regulatory requirements for ingestible or dermally applied products.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
