English
Español
tiếng việt
русский
Natural earth-derived iron oxide pigment with consistent mineral composition and excellent batch-to-batch reproducibility.
High tinting strength and opacity suitable for demanding industrial coloration requirements.
Thermally stable up to 350°C, maintaining color integrity in high-temperature processing environments.
Low water-soluble salts content, ensuring superior resistance to efflorescence in cementitious systems.
Non-toxic, heavy metal-free formulation compliant with EU REACH and US EPA guidelines for general industrial use.
Architectural concrete and precast concrete products for natural earth-tone finishes.
Stucco, plaster, and dry-mix mortars requiring durable, weather-resistant coloration.
Ceramic glazes and clay-based tiles where thermal stability and oxide compatibility are critical.
Industrial coatings and protective paints for infrastructure and metal substrates.
Plastic masterbatches for outdoor applications requiring UV-stable, inorganic colorants.
| Chemical Type | Natural iron oxide (Fe₂O₃·H₂O) with clay and manganese oxide matrix |
| Product Form | Fine, free-flowing powder |
| Appearance | Uniform brownish-umber granular powder |
| Primary Applications | Concrete, stucco, ceramics, coatings, plastics |
| Key Features | Lightfastness: Excellent; Weather resistance: Superior; Alkali resistance: High |
| Benefits | Reduced dosage vs. synthetic alternatives; Low abrasivity; Minimal impact on setting time |
| pH (10% aqueous slurry) | 6.5 – 7.5 |
| Volatile Matter (105°C, 2 hrs) | ≤ 5.0 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 404RU Raw Umber?
A: Cathay Hoover 404RU is a naturally derived, iron oxide–based inorganic pigment, primarily composed of hydrated iron oxide (Fe₂O₃·nH₂O) with naturally occurring manganese and clay mineral impurities that contribute to its characteristic earthy brown hue and matte finish.
Q2: Is 404RU suitable for use in exterior architectural coatings?
A: Yes — as a stable, lightfast, and weather-resistant iron oxide pigment, 404RU 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 404RU differ from burnt umber pigments?
A: Raw umber (like 404RU) is the natural, unheated form — cooler, lighter, and greener-toned — whereas burnt umber results from calcination, yielding a warmer, redder, and darker shade with higher tinting strength and reduced moisture content.
Q4: Can 404RU be dispersed in water-based systems without surfactants?
A: While 404RU exhibits good compatibility with aqueous media, optimal dispersion and long-term colloidal stability in water-based paints or inks typically require appropriate wetting agents or dispersants tailored to iron oxide surfaces.
Q5: What is the typical dosage range for 404RU in polymer coloration applications?
A: Dosage varies by polymer type and desired shade intensity, but 404RU is generally used at low concentrations — typically ranging from 0.1% to 2% by weight — due to its high opacity and moderate tinting strength.
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
Have a Questions? Call Us:
Add:
Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
