High-Purity HA500 Activated Alumina Micro-Powder with High Sintering Reactivity for High-Performance Refractory Castables

HA500 Reactive Alumina Powder is a high purity alumina material designed for refractory castables and advanced ceramic applications. It provides excellent sintering activity, optimized particle packing and improved mechanical strength for high-temperature products. Manufactured under strict ISO 9001, ISO 14001, and ISO 45001 certified operations, HA500 features an exceptionally low alkali content (Na₂O ≤ 0.10%) and iron impurity (Fe₂O₃ ≤ 0.03%) to prevent premature slagging at elevated temperatures. With a sub-micron median particle size (D50 Cilas = 0.5 μm), a controlled BET surface area (7.5 m²/g), and a singlet particle distribution, HA500 guarantees optimal matrix packing and rheological stability.

• Ultra-Low Impurity Profile: Max 0.10% Na₂O, 0.03% Fe₂O₃, 0.07% SiO₂ maintain hot modulus of rupture (HMOR).
• Sub-Micron Particle Sizing: D50 of 0.5 μm (0.3-0.6 μm range) and D90 ≤ 3.0 μm allow tight packing between aggregate particles.
• Singlet Particle Morphology: Disperses smoothly without severe agglomeration, optimizing slip viscosity and castable workability.
• High Sintering Reactivity: BET surface area of 6.5-8.5 m²/g ensures rapid densification and predictable firing shrinkage.

1. Low Cement Refractory Castables
HA500 Reactive Alumina Powder improves particle packing density, reduces water demand and enhances the strength and durability of low cement refractory castables.

2.High Performance Castables
The high purity and excellent sintering activity of HA500 help refractory castables achieve better mechanical strength, thermal stability and resistance to high-temperature environments.

3. Spray Coatings
Reactive alumina powder provides good flowability and bonding performance, making it suitable for refractory spray coatings with improved adhesion and service life.

4. Precast Refractory Products
HA500 alumina powder enhances the density, strength and structural stability of precast refractory components used in industrial furnaces.

5. Advanced Ceramics
Due to its high purity and fine particle distribution, HA500 is suitable for advanced ceramic products requiring excellent performance and reliability.

6. Steel Industry Refractories
HA500 Reactive Alumina Powder is widely used in steel industry refractory materials, helping improve wear resistance and thermal shock resistance under severe conditions.

We customize HA500 specifications to align with your processing parameters. Custom packaging options—including 25kg moisture-barrier paper bags, 1000kg bulk sacks, and custom palletizing—are supplied under complete safety and environmental compliance standards.

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