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Tabular Alumina

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Tabular alumina ALFA TAB® is alumina obtained with the sintering of calcined alumina. The production of the own raw material basis, detailed control of process parameters and stable thermal processing ensure high-quality products in accordance with customer needs and requirements.
During sintering, alpha-alumina crystals are combined to shape greater crystals, which give tabular alumina its specific properties. The shrinkage that occurs during the combining of the crystals leads to a unified crystal structure, low porosity and high density of the product. Different types of tabular alumina ALFA TAB® have different physical and chemical properties that enable diverse use.
  • Tabular alumina is one of the most commonly used oxides in refractory material production, such as different types of concrete, brick, monolithic products, insulation materials and other products.

  • Thermostability, electrical resistance, strength, high melting point and resistance against chemicals enable a broad field of application of tabular alumina in the ceramics industry.

  • Epoxy resins

    Adding alumina to epoxy resins enhances the mechanical properties (e.g. strength and abrasion resistance), thermal conductivity and dielectric properties of materials.
  • Oil industry

    The excellent properties of tabular alumina, such as chemical and thermostability, enable its use in processes that run under exacting conditions.
  • Foundry industry

    The characteristics of low-alkaline tabular alumina ALFA TAB®, especially the low impurity content, make it interesting for use in the foundry industry, especially in modular casting.
Chemical Composition (%)ALFA TAB® 06ALFA TAB® 30
  (Typical) (Typical)
Al2O3 99.5 99.5
Fe2o3 0.08 0.08
SiO2 0.04 0.04
Na2O (Total) 0.04 0.3
CaO 0.02 0.02
Fe Magnetic1 ≤ 0.0251 ≤ 0.0251

1 Also possible Fe Magnetic ≤ 0,007  – (LI)

Physical Characteristics TypicalMinMax
Bulk specific gravity 2 (g/cm3) 3.55 3.5  
Apparent porosity (%) 4   5
Water absorption (%) 1.5   2

 2 Bulk density also possible: 3.6 - 3.7 g/cm3

Standard Grain Sizes3

(mm)(mesh) (mm)(mesh)
0–6 –¼   CD Balls /
0–3 –6   6–12 ½–¼
0–2 –8   3–6 3–6
0–1 –14   2–6 ¼–8
0–0.5/0.6 –28   2–3 6–8
0–0.3 –48   1–3 6–14
0–0.2 –100   1–2 8–14
0–0.045 –325   0.5/0.6–1 14–28
0–0.020 –635   0.3–0.6 28–48

3 other grain sizes also possible

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