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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 suitable for processing temperatures up to 800 °C without significant color shift or decomposition.
Non-toxic, heavy metal-free formulation compliant with global regulatory standards including EN 71-3 and ASTM F963.
Low oil absorption (18–22 g/100g) enabling efficient dispersion in both aqueous and solvent-based systems.
Excellent lightfastness (ASTM D2244 ΔE < 1.0 after 3000 hrs QUV exposure) and weather resistance in exterior applications.
Architectural and industrial coatings requiring durable, UV-stable earth-tone pigmentation.
Ceramic glazes and clay bodies for tiles, sanitaryware, and stoneware products.
Concrete and mortar colorants for precast elements, paving stones, and façade panels.
Plastic masterbatches for construction profiles, agricultural films, and outdoor furniture.
Artist-grade acrylics, oils, and watercolor paints demanding archival permanence and non-fugitive color.
| Chemical Type | Natural iron oxide (Fe₂O₃·H₂O) with minor manganese and aluminum oxides |
| Product Form | Fine dry powder |
| Appearance | Free-flowing, granular, reddish-brown to yellowish-brown powder |
| Primary Applications | Coatings, ceramics, concrete, plastics, artists’ colors |
| Key Features | Non-hazardous, alkali-resistant, pH stable (5–12), low volatility |
| Benefits | Reduced VOC impact, no migration in polymer matrices, minimal dust generation |
| Particle Size (D50) | 1.8–2.4 μm (laser diffraction) |
| LOI (Loss on Ignition, 1000 °C) | 12–15 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 417RU?
A: Cathay Hoover 417RU is a naturally derived, iron oxide–based inorganic pigment, primarily composed of hydrated iron oxide (Fe₂O₃·nH₂O) with minor amounts of manganese and aluminum oxides, contributing to its characteristic raw umber hue.
Q2: Is 417RU suitable for use in exterior architectural coatings?
A: Yes — as a stable, lightfast, and weather-resistant iron oxide pigment, 417RU is widely used in exterior-grade architectural paints, stucco, and concrete colorants where long-term UV stability and alkali resistance are required.
Q3: How does 417RU differ from burnt umber pigments?
A: Unlike burnt umber, which is thermally processed to yield a warmer, reddish-brown tone, 417RU is the uncalcined (raw) form — offering a cooler, greenish-brown shade with higher moisture content and slightly lower tinting strength.
Q4: Can 417RU be dispersed in water-based systems without special additives?
A: It can be readily dispersed in aqueous media using standard surfactants or dispersing agents; however, optimal stabilization and consistency typically require formulation-specific wetting aids to ensure uniform particle distribution and prevent reagglomeration.
Q5: What is the typical dosage range for 417RU in industrial coatings?
A: Dosage depends on desired opacity and shade intensity, but it is generally used at low concentrations — typically ranging from 0.1% to 2% by weight in finished coating formulations.
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E-mail: wangxingqiang@ericwchem.com
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