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High thermal stability up to 800 °C, ensuring color retention in high-temperature processing.
Excellent lightfastness and weather resistance, maintaining consistent hue under prolonged UV exposure.
Non-toxic, heavy-metal-free formulation compliant with global regulatory standards including EN 71-3 and RoHS.
Superior tinting strength and dispersion efficiency in both aqueous and solvent-based systems.
Low oil absorption (< 25 g/100 g), enabling high loading capacity and improved formulation viscosity control.
Architectural and industrial coatings requiring durable earth-tone pigmentation.
Ceramic glazes and engobes for stoneware and porcelain applications.
Plastic coloration for outdoor furniture, automotive interior trims, and construction profiles.
Concrete and mortar colorants for precast elements and architectural concrete finishes.
Inorganic pigment masterbatches for polyolefin and PVC compounds.
| Chemical Type | Natural iron oxide-based (Fe₂O₃–MnO complex) |
| Product Form | Fine dry powder |
| Appearance | Uniform reddish-brown granular powder |
| Primary Applications | Coatings, plastics, ceramics, construction materials |
| Key Features | Heat stable, UV resistant, non-hazardous, low oil absorption |
| Benefits | Consistent batch-to-batch color, easy dispersibility, regulatory compliance |
| pH (10% aqueous slurry) | 6.5 – 7.5 |
| Volatile Matter (105 °C, 2 hrs) | ≤ 1.0 wt% |
Q1: What is the primary chemical composition of Cathay Hoover 516BU?
A: Cathay Hoover 516BU is an iron oxide-based inorganic pigment, primarily composed of hydrated iron oxides and manganese-modified iron oxides, thermally processed to achieve its characteristic burnt umber hue. It contains no organic dyes or synthetic azo compounds.
Q2: Is this pigment suitable for use in exterior architectural coatings?
A: Yes — 516BU exhibits excellent lightfastness, weather resistance, and alkali stability, making it well-suited for exterior masonry paints, stucco systems, and concrete colorants where long-term color retention under UV exposure and environmental stress is required.
Q3: How does 516BU compare to natural umber in terms of tinting strength and consistency?
A: As a calcined synthetic pigment, 516BU offers significantly higher and more reproducible tinting strength than natural umber earths, along with tighter particle size distribution and batch-to-batch color consistency — critical for industrial coating and construction material applications.
Q4: Can 516BU be used in water-based systems without dispersion additives?
A: While 516BU is inherently compatible with aqueous media, optimal performance in water-based paints and plasters typically requires standard wetting and dispersing agents to ensure uniform distribution, prevent agglomeration, and maximize color development and stability.
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