Product Description

HUAO calcined alumina powder is manufactured from carefully selected low sodium raw materials using precision micro grinding and deep processing techniques. Produced under strict quality control in our ISO 9001, ISO 14001, and ISO 45001 certified facilities, this product features a highly developed alpha phase crystal structure (α-Al₂O₃ ≥ 93-94%) with a density of ≥ 3.94 g/cm³. Available in HA-1 and HA-2 primary grades, our calcined micro powders provide global B2B customers with predictable batch consistency, high resistivity, and the thermal stability required for structural ceramics, electronic substrates, refractory materials, and high-precision polishing compounds.

Technical Parameters

Note: Particle sizes and grain distribution profiles can be prepared according to specific customer requirements.

Key Features

• Controlled Low Na₂O Profile: Low soda content (Na₂O ≤ 0.15% for HA-2) limits dielectric loss and supports electrical insulation performance in electronic components.
• High α-Phase Conversion: Complete calcination yields a dominant alpha phase (≥ 94%) with a high true density (≥ 3.94 g/cm³), aiding stable linear shrinkage during sintering.
• High Mechanical Hardness & Strength: High intrinsic crystal hardness delivers severe wear and abrasion resistance in demanding mechanical applications.
• Thermal Stability & Resistivity: High melting points and excellent thermal conductivity allow heat dissipation while preserving high electrical resistivity under operating thermal loads.
• Narrow Particle Distribution: Tight grain control (D50: 4-5 μm; 325 mesh residue ≤ 1%) provides uniform dispersion and packing behavior in compounding processes.

Applications

• Architectural & Structural Ceramics: Used to enhance microstructural density, cold crushing strength, and surface finish in wear-resistant ceramic tiles, valve disks, and mechanical components.
• Electronic Equipment & Substrates: Serves as an insulating ceramic material for circuit substrates, spark plugs, and electronic packaging due to its high resistivity and thermal dissipation.
• Refractory Materials & Monolithics: Functions as a fine matrix filler in high-alumina bricks and castable systems to increase hot strength and volume stability at elevated temperatures.
• Polishing & Wear-Resistant Materials: Applied as a precision polishing abrasive for metal, glass, and semiconductor surfaces, offering stock removal rates and surface finishes.

Why Choose HUAO

We have traceable quality management. Produced under ISO 9001, ISO 14001, and ISO 45001 management systems with chemical and physical testing on every batch to maintain container-to-container consistency.

Advanced deep processing allows us to supply ultra-pure HA-2 grades (Al₂O₃ ≥ 99.6%, Na₂O ≤ 0.15%) for demanding technical ceramics.

Beyond standard 4-5 μm specifications, our milling and classification capabilities allow grain sizes to be customized to align with client dry pressing, slip casting, or tape casting setups.

Customization

HUAO provides particle size tailoring based on client technical requirements. Export packaging options include standard 25kg multi-wall paper bags, 50kg bags, and 1000kg/1250kg jumbo bulk sacks with inner moisture-proof liners configured for international ocean freight.

FAQ

A1: HA-2 provides higher chemical purity (Al₂O₃ ≥ 99.6%), lower soda content (Na₂O ≤ 0.15%), higher α-phase conversion (≥ 94%), and higher true density (≥ 3.94 g/cm³) compared to HA-1, making it preferred for electronic ceramics.

A2: Yes, while standard D50 is 4-5 μm, HUAO provides tailored grinding and classification according to specific client processing specifications.

A3: Both HA-1 and HA-2 grades maintain a 325 mesh residue limit of ≤ 1% to avoid coarse agglomerates in wet or dry mixing lines.

We also provide other alumina products. If you would like to learn more about Ceramic Wear Liners, please click here.