English
Español
tiếng việt
русский
High thermal stability up to 800°C, ensuring color retention in high-temperature processing.
Excellent lightfastness and weather resistance, meeting ISO 105-B02 (Grade 7–8).
Non-toxic, heavy-metal-free formulation compliant with EN 71-3 and RoHS directives.
Consistent particle size distribution for optimal dispersion and tinting strength.
Low oil absorption (<25 g/100g), enabling efficient pigment loading in binder systems.
Architectural and industrial coatings requiring durable earth-tone pigmentation.
Ceramic glazes and underglaze decorations fired at stoneware and porcelain temperatures.
Concrete and cement-based products including precast elements and terrazzo flooring.
Plastic masterbatches for outdoor applications such as garden furniture and construction profiles.
Artist-grade acrylics, oils, and watercolor paints demanding archival stability.
| Chemical Type | Natural iron oxide hydrate (α-FeOOH) |
| Product Form | Fine dry powder |
| Appearance | Free-flowing yellowish-brown powder |
| Primary Applications | Coatings, ceramics, concrete, plastics, artists’ colors |
| Key Features | Heat stable, lightfast, non-toxic, UV resistant |
| Benefits | Consistent hue, low migration, excellent dispersibility |
| pH (10% aqueous slurry) | 6.5–7.5 |
| Volatile Matter (105°C, 2h) | ≤1.0% |
Q1: What is the primary chemical composition of Cathay Hoover 204RS Raw Sienna?
A: Cathay Hoover 204RS is an iron oxide-based inorganic pigment, primarily composed of hydrated iron oxide (Fe₂O₃·nH₂O), consistent with the natural earth pigment profile of raw sienna. It contains no added heavy metals or organic dyes.
Q2: Is this pigment suitable for use in architectural coatings and exterior applications?
A: Yes — 204RS exhibits excellent lightfastness, thermal stability, and weather resistance, making it well-suited for exterior architectural paints, plasters, and concrete colorants where long-term color retention under UV exposure and moisture cycling is required.
Q3: How does 204RS differ from burnt sienna or synthetic iron oxide reds?
A: Unlike burnt sienna (which is calcined and yields a redder, warmer tone), 204RS retains the natural yellowish-brown hue of raw sienna due to its lower-temperature processing. Compared to high-purity synthetic iron oxide reds, it offers a more muted, earthy chroma and broader particle size distribution, contributing to softer tinting strength and improved dispersion stability in aqueous systems.
Q4: What are typical dosage guidelines when incorporating 204RS into paint or polymer formulations?
A: Dosage depends on the desired opacity, shade depth, and base formulation, but 204RS is typically used at low concentrations — generally ranging from 0.1% to 2% by weight in most architectural coatings and construction materials. Optimization requires lab-scale trials to balance color development, rheology, and cost efficiency.
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
