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Natural earth-derived iron-manganese oxide pigment with consistent warm brown hue and excellent lightfastness.
High tinting strength and good dispersion stability in both aqueous and solvent-based systems.
Non-toxic, heavy metal-free formulation compliant with EN 71-3 and ASTM F963 safety standards.
Thermally stable up to 300°C, suitable for medium-temperature industrial coating and plastic processing.
Low oil absorption (18–22 g/100g) enabling high loading capacity without compromising viscosity or film integrity.
Architectural and industrial waterborne and solventborne coatings (e.g., primers, masonry paints, anti-corrosive finishes).
Polyolefin, PVC, and engineering thermoplastic coloration for outdoor profiles, pipes, and construction components.
Cementitious systems including concrete admixtures, tile grouts, and decorative stucco finishes.
Artist-grade acrylics, oils, and dry media requiring archival stability and natural earth pigment authenticity.
Industrial inks for packaging, labeling, and security printing where UV resistance and chemical inertness are critical.
| Chemical Type | Natural iron-manganese oxide (hydrated) |
| Product Form | Fine dry powder |
| Appearance | Uniform olive-brown to reddish-brown free-flowing powder |
| Primary Applications | Coatings, plastics, construction materials, artist pigments |
| Key Features | Lightfastness: ASTM Level 8; Heat Stability: ≤300°C; pH (5% slurry): 6.5–7.5 |
| Benefits | Low VOC impact, no azo dyes or synthetic organics, REACH-compliant |
| Particle Size (D50) | 1.8–2.4 μm |
| Volatile Matter (105°C, 2h) | ≤1.2% |
Q1: What is the primary chemical composition of Cathay Hoover 412RU?
A: Cathay Hoover 412RU is a naturally derived, iron oxide–based inorganic pigment, primarily composed of hydrated iron oxides (Fe₂O₃·nH₂O) and clay minerals, consistent with the typical mineralogical profile of raw umber earth pigments.
Q2: Is 412RU suitable for use in architectural coatings and exterior applications?
A: Yes — as a stable, lightfast, and weather-resistant inorganic pigment, 412RU is widely used in exterior-grade architectural paints, plasters, and concrete colorants where long-term UV stability and alkali resistance are required.
Q3: How does 412RU differ from burnt umber or synthetic iron oxide brown pigments?
A: Unlike burnt umber (which is calcined and yields a warmer, redder tone), 412RU retains its natural greenish-brown hue due to unaltered mineral structure and moisture content. Compared to synthetic iron oxides, it offers a more complex, earthy undertone and lower tinting strength, making it preferred for subtle, naturalistic color effects.
Q4: What dispersion considerations should be taken when incorporating 412RU into water-based systems?
A: Due to its natural particulate morphology and surface polarity, 412RU typically requires standard wetting and dispersing agents commonly used for mineral pigments. Pre-wetting and moderate shear during mixing help achieve uniform distribution and optimal color development.
Q5: Can 412RU be used in food-contact or pharmaceutical applications?
A: No — Cathay Hoover 412RU is not certified for direct food contact, ingestion, or pharmaceutical use. It is formulated and tested for industrial coating, construction, and general-purpose coloration applications only.
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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
