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Naturally derived iron oxide-based pigment with consistent earthy brown hue and excellent lightfastness.
High tinting strength and opacity, enabling efficient color development in low-addition formulations.
Excellent thermal stability up to 250 °C, suitable for high-temperature processing applications.
Low water solubility and superior alkali resistance, ensuring long-term performance in cementitious and plaster systems.
Free-flowing, dust-reduced powder form with optimized particle size distribution for uniform dispersion.
Architectural coatings and exterior wall paints requiring durable, weather-resistant brown tones.
Cement-based products including concrete pavers, precast elements, and mortar coloring.
Tile grouts and joint fillers where chemical resistance and color permanence are critical.
Plaster and stucco systems for interior and exterior decorative finishes.
Ceramic glazes and engobes for low-fire earthenware applications.
| Chemical Type | Natural hydrated iron oxide (Fe₂O₃·H₂O) with clay matrix |
| Product Form | Free-flowing dry powder |
| Appearance | Uniform yellowish-brown to olive-brown granular powder |
| Primary Applications | Concrete, plaster, coatings, grouts, ceramics |
| Key Features | Lightfast, alkali-stable, heat-resistant, non-toxic |
| Benefits | Color consistency, low dosage requirement, minimal impact on binder rheology |
| Storage Conditions | Store in cool, dry, well-ventilated area away from moisture and direct sunlight |
| Shelf Life | 24 months from date of manufacture under recommended storage conditions |
Q1: What is the primary chemical composition of Cathay Hoover 406RU Raw Umber Pigment?
A: Cathay Hoover 406RU is a naturally derived iron oxide-based pigment, primarily composed of hydrated iron oxide (Fe₂O₃·nH₂O) with variable manganese content, which contributes to its characteristic earthy brown hue and inherent lightfastness.
Q2: Is 406RU suitable for use in solvent-based industrial coatings?
A: Yes, 406RU exhibits excellent compatibility with common organic solvents and resin systems used in industrial alkyd, epoxy, and polyurethane coatings. Its low oil absorption and stable particle surface support good dispersion and long-term suspension in non-aqueous media.
Q3: How does 406RU differ from burnt umber pigments in terms of color and performance?
A: As a raw umber, 406RU delivers a cooler, lighter, and more greenish-brown tone compared to burnt umber, which is heat-treated to yield a deeper, reddish-brown shade. Raw umber also retains higher moisture content and typically offers slightly lower tinting strength but enhanced UV stability in certain outdoor applications.
Q4: What dispersion methods are recommended for optimal performance in high-solids paint formulations?
A: For high-solids systems, pre-wetting with compatible solvents followed by high-shear dispersion using rotor-stator or bead mill equipment is recommended. Avoid excessive grinding that may damage the natural crystalline structure and reduce opacity or color consistency.
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E-mail: wangxingqiang@ericwchem.com
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