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High thermal stability up to 800 °C, ensuring color integrity in high-temperature processing.
Excellent lightfastness and weather resistance, suitable for long-term outdoor exposure.
Non-toxic, heavy-metal-free formulation compliant with global regulatory standards including EN 71-3 and RoHS.
Strong tinting strength and consistent batch-to-batch color reproducibility.
Good dispersibility in both aqueous and solvent-based systems without requiring specialized wetting agents.
Architectural coatings and exterior wall paints.
Ceramic glazes and underglaze decorations.
Plastic coloration for automotive interior components.
Concrete and mortar pigmentation for precast and ready-mix applications.
Industrial powder coatings requiring heat resistance and UV stability.
| Chemical Type | Iron oxide–manganese oxide complex (calcined natural umber) |
| Product Form | Fine dry powder |
| Appearance | Uniform reddish-brown to dark brown granular powder |
| Primary Applications | Coatings, plastics, ceramics, construction materials |
| Key Features | Heat stable, lightfast, chemically inert, non-volatile |
| Benefits | Low VOC impact, minimal effect on polymer rheology, pH-stable |
| Storage Conditions | Store in cool, dry, well-ventilated area away from moisture and direct sunlight |
| Shelf Life | 36 months from date of manufacture when stored properly |
Q1: What is the primary chemical composition of Cathay Burnt Umber UB39?
A: Cathay Burnt Umber UB39 is a calcined iron-manganese oxide-based inorganic pigment, derived from natural umber ore through controlled thermal oxidation. Its color intensity and stability arise from the synergistic interaction of Fe₂O₃ and MnO₂ in a crystalline matrix.
Q2: Is UB39 suitable for use in high-temperature polymer processing, such as polyolefin coloring or engineering plastics compounding?
A: Yes — UB39 exhibits excellent thermal stability and retains its color integrity during melt processing up to approximately 300°C, making it well-suited for polypropylene, polyethylene, and other thermoplastics where heat resistance is critical.
Q3: How does UB39 compare to synthetic iron oxides in terms of UV resistance and weathering performance?
A: As a fully inorganic, calcined pigment, UB39 offers superior UV stability and long-term outdoor durability compared to many organic pigments and some uncalcined iron oxides. It shows minimal fading or chalking under prolonged exposure to sunlight and atmospheric conditions.
Q4: Can UB39 be used in water-based architectural coatings without compromising dispersion stability or tinting strength?
A: Yes — when properly surface-treated or pre-dispersed, UB39 achieves good compatibility and rheological behavior in aqueous systems. Its inherent low solubility and robust particle structure support stable dispersions and consistent color development in latex paints and plasters.
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