High-Purity Sintered Tabular Alumina Aggregate

HUAO tabular alumina is a pure sintered corundum material produced without any sintering additives, such as MgO or B₂O₃, it is fully densified through complete sintering at ultra-high temperatures. The resulting material consists of large, well-developed tabular alpha-alumina (α-Al₂O₃) crystalline grains with an Al₂O₃ purity exceeding 99.2%. Processed from fine alumina powder via fine milling, roll compaction, and high-temperature firing, HUAO Tabular Alumina is supplied in white granular and powder forms. It serves as an essential raw material for global B2B clients manufacturing high-performance monolithic refractories, shaped firebricks, and wear-resistant industrial components.

Technical Parameters

Key Features

• Additive-Free Pure Corundum: Free of MgO, B₂O₃, and other additive impurities, preserving high thermal resistance and refractoriness under severe load.
• Large Well-Developed α-Al₂O₃ Grains: Ultra-high temperature firing promotes large, tabular alpha-alumina crystal growth, delivering high mechanical strength and thermal shock resistance.
• High Bulk Density & Low Porosity: Reaches a bulk density of ≥ 3.5 g/cm³ and low apparent porosity (≤ 5.0%), providing resistance against liquid metal penetration and slag erosion.
• Strict Chemical Control: Maintains silica (SiO₂ ≤ 0.09%) and iron oxide (Fe₂O₃ ≤ 0.02%) limits to prevent premature structural breakdown in high-temperature environments.
• Low Moisture Absorption: Standardized post-processing keeps moisture content ≤ 1.5%, ensuring stable binder hydration behavior during mixing and casting.

Applications

• High-Performance Unshaped Refractories: Acts as a core aggregate and fine filler in low-cement, ultra-low cement, and self-flowing castables for steel ladles, tundishes, and iron runners.
• Functional Refractory Bricks & Shapes: Used in manufacturing slide gates, purging cones, nozzles, breathable bricks, and high-alumina kiln furniture required for continuous steel casting.
• Wear-Resistant & Structural Ceramics: Incorporated into high-density ceramic linings, grinding media, and wear-resistant tiles where hardness and mechanical impact strength are required.

Why Choose HUAO

• Certified Manufacturing Control: Produced under ISO 9001, ISO 14001, and ISO 45001 management systems, HUAO enforces chemical analysis and physical testing across every production lot to guarantee consistent quality.
• Advanced Roll Compaction & Sintering: Our fine milling, roll compaction, and ultra-high temperature firing processes yield uniform crystal structures and minimal internal micro-cracks.
• Direct Factory Supply Security: As a direct manufacturer and international B2B exporter, HUAO ensures continuous bulk supply capacity, direct pricing, and dedicated ocean shipping support.

Customization

HUAO supplies tabular alumina in customizable grain sizes (including standard mesh sizes, lump aggregates, and fine powders) to match specific customer formula requirements. Export packaging options include 25kg multi-wall bags and 1000kg/1250kg jumbo bulk sacks fitted with moisture-proof inner liners, fully palletized and shrink-wrapped for international freight.

FAQ

A1: HUAO tabular alumina is a pure sintered corundum produced without additives like MgO or B₂O₃. Its large, well-developed α-Al₂O₃ crystals and low closed porosity provide superior thermal shock resistance and volume stability at elevated temperatures.

A2: HUAO tabular alumina delivers an Al₂O₃ purity ≥ 99.2%, a bulk density ≥ 3.5 g/cm³, apparent porosity ≤ 5.0%, and a moisture content ≤ 1.5%.

A3: We manufacture tabular alumina in both granular aggregate sizes and fine powders. Shipments are packaged in 25kg bags or 1000kg jumbo ton bags with moisture barriers, arranged directly from our factory.

A4: Maintaining SiO₂ ≤ 0.09% and Fe₂O₃ ≤ 0.02% limits low-melting phase formation, helping refractories maintain high hot modulus of rupture (HMOR) and resist chemical slag attack.

A5: Yes, our fine milling and screening equipment allows us to supply customized grain size distributions tailored to customer processing parameters.

We also provide other alumina products. If you would like to learn more about Reactive Alumina, please click here.