Reactive Alumina HA120 Micro-Powder with Ultra-Low Na₂O ≤ 0.12%, Doublet Grain Distribution, and High Densification Rate

Product Overview

HUAO Reactive Alumina HA120 is a sub-micron alumina powder developed for applications that require high reactivity, efficient sintering, and controlled chemical composition. With a D50 of 1.2 μm and a BET specific surface area of 4.8 m²/g, it supports faster densification and more uniform matrix formation during processing. Its specialized doublet particle size distribution helps fine particles fill structural voids effectively, improving packing and sintering behavior in pressed or cast materials. HA120 also features controlled impurity levels, with Na₂O typically at 0.08% (max. 0.12%) and SiO₂ typically at 0.03% (max. 0.07%). Produced under ISO9001, ISO14001, and ISO45001 certified management systems, it provides consistent quality for advanced ceramics and high-performance unshaped refractories.

Technical Specifications

Key Features

• Engineered Doublet Distribution: The tailored doublet distribution improves particle packing by allowing fine alumina grains to fill matrix gaps more effectively, supporting a denser microstructure after firing.
• High Surface Area and Sinterability: With a BET surface area of 4.0–5.5 m²/g and a typical value of 4.8 m²/g, HA120 provides high surface activity and supports efficient densification during sintering.
• Controlled Sub-Micron Particle Size: A D50 of 0.8–1.5 μm, typically 1.2 μm, with D90 ≤6.8 μm, helps achieve uniform particle dispersion and consistent matrix formation.
• Low Alkali Content: Na₂O is controlled at a maximum of 0.12%, helping limit unwanted low-melting phases and maintain material stability during high-temperature service.
• Low Water Demand: Its optimized particle morphology supports good flow and packing in castable formulations, helping reduce the amount of mixing water required during processing.
  
  
  
  

Applications

• Steel Refractories: Used in ultra-low cement and no-cement castables for ladles, tundishes, and iron runners to support early strength development during heating.
• Technical Ceramics: Applied in structural ceramics, mechanical seal rings, and wear-resistant components where high density, dimensional stability, and smooth surfaces are required.
• Refractory Shapes and Kiln Furniture: Added to high-alumina bricks and functional ceramic components to improve cold crushing strength and hot performance under continuous thermal loads.

Why Choose HUAO

Proven Factory Quality Management: Produced in ISO-certified plants, HUAO enforces strict process controls across raw material calcination, jet milling, and final particle classification to deliver stable specifications across containers.

Optimized Processing Yields: The fine particle size distribution of HA120 helps ceramic plants achieve dense green bodies, reducing firing cracking risks and improving total finished product yield.

Direct Export Capability & QC Traceability: As a direct factory manufacturer and exporter with extensive B2B experience, HUAO provides full batch Certificate of Analysis (COA) documents and standardized sea-freight logistics handling for every shipment.

Packaging Options

HUAO provides adaptable packaging solutions to protect fine reactive powders against ambient moisture during international shipment. Packaging options include 25kg multi-layer paper bags, 1000kg/1250kg jumbo bulk bags with moisture-barrier liners, and wooden-palletized wrapping suited for global container shipping.

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