Calcined Alumina Powder

HUAO Calcined Alumina is manufactured from low-sodium calcined alumina raw material through precision grinding and deep processing techniques. HA-1 and HA-2 deliver high alpha-phase conversion (α-Al₂O₃ ≥ 93% for HA-1; ≥ 94% for HA-2), high physical density, and minimal trace chemical impurities. Featuring a high melting point, high thermal conductivity, and outstanding electrical resistivity, HUAO Calcined Alumina serves as a vital functional material for global B2B clients in advanced technical ceramics, refractory linings, electronics, and precision polishing compounds.

Particle size can be prepared according to customers' requirements.

Delivers an α-Al₂O₃ content of ≥ 93% (HA-1) and ≥ 94% (HA-2), ensuring consistent crystal stability, low firing shrinkage, and excellent hardness.

Low Na₂O concentrations (≤ 0.15% for HA-2) and strict silica/iron oxide limits optimize electrical insulation and high-temperature thermal durability.

Features a physical density of up to ≥ 3.94 g/cm³ alongside a high melting point, promoting rapid densification during ceramic sintering.

High resistivity and high thermal conductivity make it an ideal ceramic substrate material for demanding electrical equipment.

Standardized D50 particle size (4–5 μm) with ≤ 1% 325 mesh residue provides predictable dispersion and rheology in slurry mixing.

Extensively used in manufacturing architectural ceramics, structural ceramics, and wear-resistant components requiring high mechanical strength and hardness.

Applied in electronic equipment due to its low soda content, high electrical resistivity, and efficient thermal dissipation.

Acts as a fine reactive filler in high-alumina bricks, unshaped monolithics, and refractory matrix formulations needing thermal volume stability.

Used as a high-hardness abrasive medium in polishing compounds, metal finishing slurries, and specialized wear-resistant materials.

Our fine milling and deep processing lines allow precise control over particle morphology and sizing, ensuring seamless batch integration into customer production lines.Custom particle size preparation ensures optimal packing density and flow behavior tailored to your specific process equipment. As an integrated manufacturing and trading supplier, HUAO guarantees reliable bulk volume delivery, direct cost savings, and secure international export packaging.

HUAO provides tailored particle size adjustments to align with your exact pressing, casting, or polishing requirements. Packaging options include moisture-proof 25kg multi-layer paper bags and 1000kg/1200kg jumbo bulk bags with inner polyethylene liners, fully palletized and shrink-wrapped for maritime transport.

Q1: Are HUAO manufacturing facilities ISO certified?

A1: Yes, HUAO operates under certified ISO 9001, ISO 14001, and ISO 45001 management systems, enforcing rigorous quality testing on every production lot for chemical purity, crystal conversion, and grain size distribution.

Q2: What is the main difference between Calcined Alumina HA-1 and HA-2?

A2: HA-2 offers higher chemical purity (Al₂O₃ ≥ 99.6%), lower soda content (Na₂O ≤ 0.15%), higher alpha-phase content (α-Al₂O₃ ≥ 94%), and higher density (≥ 3.94 g/cm³) compared to HA-1, making it ideal for high-spec electronic ceramics and high-purity applications.

Q3: Can HUAO supply customized particle size distributions for Calcined Alumina?

A3: Yes, while our standard D50 median size is 4–5 μm, particle sizes can be prepared and fine-milled according to specific customer requirements.

Q4: Why is low sodium content important in calcined alumina powder?

A4: Low Na₂O content improves electrical resistivity and dielectrics in electronic components while raising high-temperature refractoriness and sintering performance.

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

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