Pure Sintered α-Al₂O₃ Tabular Alumina with Purity ≥ 99.2% for Superior Thermal Shock Resistance and Additive-Free Composition
99.2% High-Purity Sintered Tabular Alumina for Thermal Shock Resistant Refractories
HUAO Tabular Alumina is a premium-grade pure sintered corundum manufactured completely free of sintering additives such as magnesium oxide or boron oxide. Through a specialized route of fine powder milling, roll compaction, and ultra-high temperature firing, the material achieves complete thermal densification. Its microstructure features large, well-developed tabular alpha-Al₂O₃ crystalline grains with an Al₂O₃ purity exceeding 99.2%. Supplied as durable white granular aggregates and fine micro-powders, HUAO Tabular Alumina serves as an essential raw material for B2B manufacturers of high-performance unshaped castables, steel continuous casting components, and severe-service industrial ceramic products.
Technical Parameters
| Chemical Composition & Physical Parameters | Content |
|---|---|
| Al₂O₃ | ≥ 99.2 % |
| SiO₂ | ≤ 0.09 % |
| Na₂O | ≤ 0.4 % |
| Fe₂O₃ | ≤ 0.02 % |
| Bulk Density | ≥ 3.5 g/cm³ |
| Apparent Porosity | ≤ 5.0 % |
| Moisture Content | ≤ 1.5 % |
Key Features
- Produced without fluxing aids like MgO or B₂O₃, completely eliminating low-melting glass phases and preserving maximum refractoriness and hot strength under load.
- Ultra-high temperature thermal sintering fosters large, interlocking alpha-Al₂O₃ crystals that provide superior thermal shock performance and mechanical spalling resistance.
- Achieving a bulk density of ≥ 3.50 g/cm³ with apparent porosity strictly controlled to ≤ 5.0%, preventing molten steel and corrosive slag penetration.
- Maintained low silica (SiO₂ ≤ 0.09%) and iron oxide (Fe₂O₃ ≤ 0.02%) levels guarantee high-temperature stability and prevent premature matrix softening.
- Standardized post-sintering handling ensures moisture absorption is ≤ 1.5%, providing predictable hydration kinetics and workability during refractory castable mixing.
Applications
HUAO products serve as critical core aggregates and fine fillers in low-cement, ultra-low cement, and advanced self-flowing castables deployed across steel ladles, tundishes, and main iron runners. They are extensively utilized in the precision manufacturing of critical functional flow control components—including slide gate plates, porous purging plugs, shrouds, and exchange nozzles. Furthermore, they are seamlessly incorporated into high-alumina kiln saggers, setter plates, and specialized industrial wear-resistant ceramic components engineered to withstand extreme thermal cycling and severe mechanical wear.
Why Choose HUAO
Our precision roll compaction process guarantees uniform green-body compaction density, effectively eliminating internal micro-defects and structural inhomogeneities prior to ultra-high temperature firing. We offer fully customizable particle size distributions—spanning coarse lump fractions down to ultra-fine micro-powders—engineered specifically to maximize particle packing density in complex refractory formulations. Backed by fully integrated manufacturing and streamlined direct-export operations, we deliver stable bulk volume availability, competitive direct-factory pricing, and comprehensive ocean logistics support.
Customization & Packaging
HUAO produces high-grade Tabular Alumina in fully customizable grain sizes—ranging from standard coarse aggregate fractions down to ultra-fine micro-powders—engineered precisely to match specific refractory formulation parameters. To guarantee cargo integrity during international transit, our export packaging configurations include durable 25 kg multi-wall woven bags and heavy-duty 1000 kg / 1250 kg jumbo bags equipped with internal polyethylene moisture barrier liners, fully palletized and securely shrink-wrapped for safe ocean freight.
FAQ
We also provide other alumina products. If you would like to learn more about Reactive Alumina, please click here.
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