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Naturally derived iron oxide-based pigment with excellent lightfastness and weather resistance.
Consistent earthy brown hue with high tinting strength and optimal dispersion in aqueous and solvent-based systems.
Non-toxic, heavy metal-free formulation compliant with global regulatory standards for industrial pigments.
Thermally stable up to 350°C, suitable for high-bake coating and polymer processing applications.
Low oil absorption ensures efficient formulation loading and improved rheology control in paints and plastics.
Architectural and industrial coatings including exterior wall paints and protective primers.
Concrete and cement-based products such as colored paving stones and precast architectural elements.
Plastic masterbatches for construction profiles, garden furniture, and outdoor consumer goods.
Ceramic glazes and underglaze decorations requiring heat-stable natural earth tones.
Printing inks for packaging and labeling where non-hazardous, UV-stable colorants are required.
| Chemical Type | Natural iron oxide (Fe₂O₃·H₂O) with clay mineral matrix |
| Product Form | Fine dry powder |
| Appearance | Free-flowing, uniform brown powder |
| Primary Applications | Coatings, construction materials, plastics, ceramics, inks |
| Key Features | Lightfast, weather-resistant, thermally stable, non-toxic |
| Benefits | High opacity, low oil absorption, easy dispersion, regulatory compliant |
| pH (10% aqueous slurry) | 6.5 – 7.5 |
| Volatile Matter (105°C, 2 hrs) | ≤ 1.5% |
Q1: What is the primary chemical composition of Cathay Hoover 402RU?
A: Cathay Hoover 402RU is a naturally derived, iron oxide–based inorganic pigment, primarily composed of hydrated iron oxides (Fe₂O₃·nH₂O) and clay minerals, consistent with the typical composition of raw umber earth pigments.
Q2: Is 402RU suitable for use in architectural coatings and decorative plasters?
A: Yes — 402RU offers excellent lightfastness, alkali resistance, and thermal stability, making it well-suited for interior and exterior architectural coatings, lime-based plasters, and mineral paints where long-term color retention and compatibility with high-pH binders are required.
Q3: How does 402RU differ from burnt umber pigments?
A: Unlike burnt umber, which undergoes thermal treatment to deepen hue and increase redness, 402RU is the uncalcined (raw) form — yielding a cooler, greenish-brown tone with lower tinting strength and higher moisture content, offering distinct chromatic and rheological behavior in water-based systems.
Q4: Can 402RU be used in cementitious applications such as concrete or mortar coloring?
A: Yes — its inherent alkaline stability and low solubility allow 402RU to be effectively dispersed in Portland cement, gypsum, and calcium silicate matrices without significant fading or efflorescence risk, typically used at low concentrations to achieve natural earth-tone shades.
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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
