Low Sodium Calcined Alumina with High Alpha Phase and 4-5 μm D50 for Advanced Alumina Ceramics

HUAO Calcined Alumina fine powder is processed from premium low-sodium raw materials through micro-grinding and advanced thermal refining. It is widely applied across architectural ceramics, electronic components, structural ceramics, refractories, wear-resistant items, and polishing media. This versatile material provides exceptional mechanical strength, high hardness, excellent electrical resistivity, and superior thermal conductivity.

Grain size can be prepared according to customer requirements.

• Advanced Micro-Grinding Granulometry: Processed to precise D50 specifications (4–5 μm) with tight mesh residue control, ensuring consistent particle packing and reactivity.
• Low-Sodium Refined Matrix: Formulated with strictly controlled sodium oxide levels to boost electrical insulation and high-temperature material stability.
• High Alpha Phase Conversion: Achieves alpha-Al₂O₃ crystal conversion rates exceeding 93% to 94%, ensuring dense structural integrity.
• Strict Impurity Suppression: Maintained ultra-low silica and iron oxide levels prevent chemical contamination and high-temperature degradation.

• Exceptional Dielectric Performance: High electrical resistivity delivers robust insulation properties, making it an ideal substrate and filler material for advanced electronic equipment.
• Superior Thermal Management: High thermal conductivity enables rapid heat dissipation across thermal interface products, electronic substrates, and high-temperature refractory frameworks.
• Enhanced Mechanical Durability: Outstanding hardness and high density (up to ≥ 3.94 g/cm³) provide superior wear resistance and structural load-bearing reliability under heavy mechanical stress.
• Reliable Volume Stability: High melting points and low ignition loss (LOI ≤ 0.1%) prevent structural deformation or shrinking during intense thermal cycling.

Widely utilized as a core fine matrix filler and raw material in electronic equipment substrates, structural ceramics, high-temperature refractories, wear-resistant engineering parts, and architectural ceramic glazes. It also serves an essential role in high-precision polishing compounds and lapping media engineered for superior surface finishing.

Export packaging configurations include reinforced 25 kg / 50 kg double woven bags or 1000 kg / 1250 kg jumbo bags with moisture barrier. All packages are fixed to fumigated or non-fumigated wood and wrapped with stretch wrap to prevent damage during long-distance ocean transportation. We also support neutral packaging and OEM printing of custom brandmarks and shipping marks. Products and packaging are customized according to customer requirements.

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