What is reactive alumina?

Reactive alumina is a sub-category of calcined alumina with very fine particle size (D50 below 1 micrometer) and high surface area (50 to 80 m2/g). It sinters at temperatures as low as 1,300 degrees C and is used in high-density ceramic bodies and polishing.

What is white fused alumina vs tabular alumina?

White fused alumina (WFA) is made by melting calcined alumina in electric arc furnaces at 2,000 degrees C+, then crushing. It is even denser than tabular but more expensive. Used in premium abrasives and high-performance refractories.

Which is better for high-alumina castables?

Tabular, because the dense structure resists slag penetration and thermal shock. A castable with 85 to 95% tabular alumina is the industry standard for steel ladles.

Can I substitute calcined for tabular?

Only in low-temperature (below 1,400 degrees C) and non-critical applications. The performance gap widens with temperature and mechanical stress.

Do you supply custom mesh sizes?

Yes, from 200# (74 micrometer) to 5000# (2.6 micrometer) for calcined, and 8# to 325# for tabular. Custom packaging available above 1 MT orders.

Aluminaworld

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ALUMINA POWDER Comparison 2026-06-12. 7 min read

Calcined Alumina vs Tabular Alumina: Choosing the Right Alpha-Al2O3 Grade

calcined alumina vs tabular alumina - comparison from Aluminaworld. ISO 9001 certified manufacturer with 15+ years export experience. Free sample available.

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