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Tabular Alumina

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Tabular Alumina
Tabular alumina is a pure sintered corundum material with coarse, well-developed α-Al₂O₃ crystals, containing more than 99% Al₂O₃. Its crystals exhibit a two-dimensional plate-like or tablet-like morphology, with typical crystal sizes of 30~200 μm and some reaching 50~400 μm. This characteristic interlocking plate-like structure increases the mechanical strength of the grains. The intra- and inter-crystalline porosity consists mainly of uniformly distributed closed micropores, giving the product a combination of high bulk density, low apparent porosity, and low water absorption.

Product Specifications

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ItemTypical Value
Crystal Formα-Al₂O₃, plate-like / tablet-like
Crystal Size30~200 μm (some up to 50~400 μm)
Melting PointApprox. 2050°C
Bulk Density≥3.50 g/cm³
Apparent Porosity≤5% (typical values as low as 2.9%)
Water Absorption≤1.5%
Key PropertiesHigh refractoriness, thermal shock resistance, creep resistance, spalling resistance, high mechanical strength, high chemical purity

Chemical Composition

Typical chemical composition of tabular alumina (varies by grade):

ConstituentHigh-Purity Grade (%)Low-Soda Grade (%)Standard Grade (%)
Al₂O₃≥99.5 ~ ≥99.7≥99.2 ~ ≥99.6≥99.2 ~ ≥99.3
Na₂O≤0.20 ~ ≤0.35≤0.05 ~ ≤0.20≤0.40
SiO₂≤0.09 ~ ≤0.20≤0.09≤0.10 ~ ≤0.15
Fe₂O₃≤0.02 ~ ≤0.10≤0.02≤0.04 ~ ≤0.05
CaO≤0.08——

Low-soda and ultra-low-soda tabular aluminas have extremely low total Na₂O contents, reducing the solubility of free Na⁺. This improves pH and viscosity stability and extends slurry life in investment casting, and minimizes potential undesirable chemical interactions between the alumina filler and matrix components in functional filler applications.

Production Specifications

After cooling, crushing, screening, and magnetic separation, tabular alumina is available in a range of grain sizes, including section sand, fine powder, and microgrit:

Specification TypeCommon Range
Section Sand0-1 mm, 1-3 mm, 3-5 mm, 5-8 mm, etc.
Fine Powder100 mesh, 200 mesh, 300 mesh, 325 mesh, etc.
Microgrit-325 mesh (-0.045 mm), etc.
Custom GrainsVarious grain and powder sizes from 25 mm down to 10 μm

Product sizes cover millimeter-scale section sand through micron-scale fine powder and microgrit. Typical fine powder particle size distribution shows 95%~97% passing -0.045 mm.

Application Scenarios

High-Performance Refractories (Core Applications):

Refractory Castables and Ramming Mixes: Used as aggregate or matrix to provide high-temperature volume stability and corrosion resistance in high-temperature equipment in the steel, foundry, and petrochemical industries.

Refractory Bricks and Kiln Furniture: Manufacture of alumina refractory bricks, high-grade kiln furniture, ceramic rollers, and pure alumina refractory base materials.

Steel Industry Full Process: Applications span the entire ironmaking and steelmaking process, including ladles, tundishes, and furnace linings.

Ceramics and Electronic Materials:

Electronic Ceramics and Insulating Materials: Utilized for solid-state circuit substrates, headers, housings, ceramic frames, spark plugs, and high-frequency insulating ceramics, leveraging excellent dielectric properties and high-temperature insulation.

Structural and Wear-Resistant Ceramics: Used in wear-resistant ceramic parts, valves, and ceramic cutting tools.

High-Alumina Grinding Media: Suitable for producing high-alumina ceramic grinding media.

Precision Casting and Surface Treatment:

Investment Casting: Low-soda tabular alumina is used in investment casting shell systems and slurries, improving slurry stability.

Grinding and Polishing: Used as abrasive or polishing media for monocrystalline silicon wafers, precision workpieces, and glass.

Functional Fillers: Used as functional fillers in epoxy resin systems, providing thermal conductivity, electrical insulation, and chemical inertness.

Our Facilities

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  • 1773993034893525307517128704
  • 1773993033893525306179145728
  • 1773993033893525304778248192
  • 1773993032893525300562972672
  • 1773993032893525299082383360
  • 1773993031893525296293171200
  • 1773993031893525294871302144
  • 1789955364129206

FAQ

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Q1: Is your company a trading firm or a manufacturing plant? Where are your facilities located?
We are an export-oriented enterprise that integrates manufacturing and sales; we are not an intermediary. Our headquarters—handling international sales, order processing, documentation, and after-sales service—is located in the Liaocheng Economic and Technological Development Zone, serving as the hub for global client relations, order negotiations, and cross-border services. Our production facility is situated in Chiping District, Liaocheng City, and specializes in the R&D, smelting, processing, and testing of white fused alumina, brown fused alumina, and other fused alumina products. This allows us to manage the entire supply chain—from primary production and rigorous quality control to direct export.


Q2: What is your production capacity and supply capability? Can you ensure a stable, long-term supply?
Our production base in Chiping features mature production lines and comprehensive processing equipment, enabling large-scale, continuous manufacturing. We offer a stable supply of our full range of white fused alumina, brown fused alumina, and related fused alumina products. With ample inventory and well-organized production scheduling, we are fully equipped to handle bulk orders, recurring annual orders, and urgent requests during peak seasons, ensuring a reliable, long-term supply for our global clients.


Q3: What are your primary export products, and what are your core offerings?
Our core exports consist of three main series of fused alumina materials: brown fused alumina, white fused alumina, and other fused alumina products. We offer a comprehensive range of specifications and particle sizes that meet various international procurement standards. Brown fused alumina is our flagship product for cost-effective industrial abrasives and refractory raw materials; white fused alumina is designed for high-purity, high-precision grinding and polishing applications; and our broader fused alumina line serves high-end refractory, specialty ceramic, and precision abrasive tool sectors—covering the full spectrum of procurement needs across all market tiers.


Q4: What are the specific applications for these three types of fused alumina, and how should one choose the right product? 1. Brown Fused Alumina: Characterized by high toughness, excellent wear and impact resistance, and a strong price-performance ratio. It is suitable for general industrial applications such as metal sandblasting (rust removal), hardware grinding, the manufacturing of grinding wheels and sandpaper, metallurgical castable refractories, and lining materials for standard industrial furnaces. It serves as a versatile, all-purpose abrasive and refractory raw material.

2. White Fused Alumina: Features high purity, high hardness, and excellent self-sharpening properties, with a pure white appearance free from impurities. It is ideal for high-precision and high-cleanliness applications, including the polishing of precision molds, grinding of aerospace components, finishing of electronic materials, and the production of high-end refractory products and precision ceramics.

3. Fused Alumina (High-Purity/Specialized): Possesses a dense structure, exceptional thermal stability, and high resistance to both heat and corrosion. It serves as a core raw material for high-end, specialized refractories, structural ceramics, precision grinding media, and linings for high-temperature industrial kilns, making it well-suited for demanding, high-performance operating environments.

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