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Naturally derived iron oxide-based pigment with consistent earthy brown hue and excellent lightfastness.
High thermal stability suitable for processing temperatures up to 350°C without color degradation.
Low water solubility and outstanding alkali resistance, ensuring durability in cementitious and plaster systems.
Optimized particle size distribution for uniform dispersion and minimal settling in liquid formulations.
Non-toxic, heavy-metal-free composition compliant with EN 71-3 and RoHS directives.
Architectural coatings including exterior masonry paints and textured stucco finishes.
Cement-based products such as colored concrete, paving slabs, and precast architectural elements.
Plaster and dry-mix mortar systems requiring natural earth-tone pigmentation.
Ceramic glazes and underglaze decorations where heat stability and chemical inertness are critical.
Plastic masterbatches for outdoor applications including garden furniture and construction profiles.
| Chemical Type | Natural iron oxide (Fe₂O₃·nH₂O) with clay and manganese oxide impurities |
| Product Form | Fine dry powder |
| Appearance | Dark brown to olive-brown free-flowing powder |
| Primary Applications | Construction materials, architectural coatings, ceramics, plastics |
| Key Features | Lightfastness grade 8 (ISO 105-B02), UV stable, pH stable (4–12) |
| Benefits | Cost-effective natural alternative to synthetic brown pigments; low VOC impact |
| Density (g/cm³) | 3.3–3.6 |
| Moisture Content (wt%) | ≤ 1.5% |
Q1: What is the primary chemical composition of Cathay Hoover 410RU?
A: Cathay Hoover 410RU is a naturally derived, iron oxide–based inorganic pigment, primarily composed of hydrated iron oxide (Fe₂O₃·nH₂O) with trace manganese and aluminum oxides contributing to its characteristic raw umber hue.
Q2: Is 410RU suitable for use in exterior architectural coatings?
A: Yes — as a naturally weather-resistant iron oxide pigment, 410RU offers excellent lightfastness, UV stability, and alkali resistance, making it well-suited for long-term performance in exterior masonry, stucco, and cementitious coatings.
Q3: How does 410RU differ from burnt umber pigments in terms of color and performance?
A: Unlike burnt umber, which is calcined to yield a warmer, reddish-brown tone, 410RU retains its natural, cooler, greenish-brown shade due to minimal thermal processing — resulting in lower tinting strength but superior heat stability and broader pH compatibility.
Q4: Can 410RU be used in water-based systems without dispersion additives?
A: While 410RU exhibits good inherent dispersibility in aqueous media, optimal color development and suspension stability are typically achieved using standard anionic or nonionic dispersants — especially in high-solids or low-VOC formulations.
Q5: What is the typical dosage range for 410RU in polymer masterbatches?
A: Dosage depends on the required depth of shade and polymer matrix, but 410RU is generally used at low concentrations — typically ranging from 0.1% to 2% by weight — to ensure uniform dispersion and avoid agglomeration.
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E-mail: wangxingqiang@ericwchem.com
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