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High thermal stability up to 800 °C, ensuring color retention during high-temperature processing.
Excellent lightfastness and weather resistance, suitable for long-term outdoor exposure.
Non-toxic and heavy-metal-free formulation compliant with global regulatory standards (EN 71-3, RoHS).
Consistent particle size distribution for uniform dispersion and optimal tinting strength.
Good acid and alkali resistance, maintaining integrity in diverse chemical environments.
Ceramic glazes and underglaze decorations requiring stable brown hues at high firing temperatures.
Architectural coatings and exterior wall paints demanding UV and weather durability.
Plastic coloration for automotive interior components and construction profiles.
Concrete and cement-based products including paving stones and façade elements.
Industrial powder coatings where heat resistance and color consistency are critical.
| Chemical Type | Natural iron oxide-based pigment (calcined hematite + manganese oxide) |
| Product Form | Fine dry powder |
| Appearance | Deep reddish-brown granular powder |
| Primary Applications | Ceramics, architectural coatings, plastics, concrete, powder coatings |
| Key Features | Thermal stability, lightfastness, non-toxicity, pH stability |
| Benefits | Color consistency, low oil absorption, easy dispersion, regulatory compliance |
| Storage Conditions | Store in cool, dry place away from direct sunlight and moisture |
| Shelf Life | 36 months under recommended storage conditions |
Q1: What is the primary chemical composition of Cathay Hoover 513BU?
A: Cathay Hoover 513BU is an iron oxide-based inorganic pigment, primarily composed of hydrated iron oxides and manganese-modified iron oxides, resulting in its characteristic burnt umber hue. It contains no organic dyes or synthetic colorants.
Q2: Is 513BU suitable for use in exterior architectural coatings?
A: Yes — 513BU exhibits excellent lightfastness, weather resistance, and alkali stability, making it well-suited for exterior masonry paints, stucco systems, and cementitious renders where long-term color retention under UV exposure and alkaline conditions is required.
Q3: How does 513BU compare to organic brown pigments in terms of heat stability?
A: As an inorganic iron oxide pigment, 513BU demonstrates superior thermal stability — it remains chemically unchanged at temperatures commonly encountered in powder coating curing, ceramic glaze firing, and polymer processing, unlike many organic brown pigments which may degrade or discolor above 180°C.
Q4: Can 513BU be used in food-contact plastics or packaging inks?
A: While 513BU complies with general heavy metal limits for industrial pigments, it is not pre-qualified for direct food-contact applications under major global regulatory frameworks. Formulators must conduct full regulatory assessment — including extraction testing and compliance verification — specific to the final application and target market.
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