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High thermal stability up to 800 °C, ensuring color retention during high-temperature processing.
Excellent lightfastness and weather resistance, meeting ISO 105-B02 (Grade 7–8) performance standards.
Non-toxic, heavy-metal-free formulation compliant with EN 71-3 and RoHS directives.
Consistent particle size distribution for optimal dispersion and tinting strength in demanding systems.
Low oil absorption (< 22 g/100 g), enabling high pigment loading without compromising viscosity or film integrity.
Architectural and industrial coatings requiring durable earth-tone aesthetics.
Ceramic glazes and underglaze decorations fired at stoneware and porcelain temperatures.
Plastic coloration for outdoor applications including automotive trim and construction profiles.
Concrete and cement-based products such as paving stones, façade panels, and precast elements.
Artist-grade acrylics, oils, and watercolor pigments where archival permanence is critical.
| Chemical Type | Iron oxide-based inorganic pigment (α-Fe₂O₃) |
| Product Form | Fine dry powder |
| Appearance | Uniform burnt sienna shade; free-flowing granular powder |
| Primary Applications | Coatings, plastics, ceramics, concrete, artist materials |
| Key Features | Thermal stability, lightfastness, chemical inertness, UV resistance |
| Benefits | Color consistency, low migration, non-flocculating, easy dispersion |
| Regulatory Compliance | REACH registered; compliant with FDA 21 CFR 73.1070 (for certain applications) |
| pH Value (5% aqueous suspension) | 6.5–7.5 |
Q1: What is the primary chemical composition of Cathay Hoover 316BS?
A: Cathay Hoover 316BS is an inorganic iron oxide-based pigment, primarily composed of calcined hematite (α-Fe₂O₃), which imparts its characteristic warm, reddish-brown burnt sienna hue and excellent thermal and light stability.
Q2: Is this pigment suitable for use in high-temperature applications such as ceramic glazes or powder coatings?
A: Yes — as a fully calcined inorganic oxide, 316BS exhibits outstanding thermal stability and is widely used in ceramic colorants, refractory products, and thermoset powder coatings where processing temperatures exceed 300°C.
Q3: How does 316BS compare to organic burnt sienna alternatives in terms of weather resistance?
A: Unlike organic counterparts, 316BS offers superior UV resistance, minimal fading under prolonged outdoor exposure, and exceptional resistance to atmospheric pollutants — making it preferred for exterior architectural coatings and façade renders.
Q4: Can this pigment be dispersed effectively in water-based systems without surfactant assistance?
A: While inherently hydrophobic due to its calcined surface, 316BS can achieve stable aqueous dispersions with appropriate wetting agents and high-shear mixing; formulation optimization is recommended for consistent rheology and color development.
Q5: What is the typical dosage range when using 316BS in architectural paints?
A: Dosage depends on the desired opacity and shade intensity, but it is generally used at low concentrations — typically ranging from 0.1% to 2% by weight in finished paint formulations.
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