Alumina microespheres

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    Main Raw MaterialCalcinate Alumina
    Alumina Content (%)≥ 93.5
    Specific Weight (g/cm3) 3.75 ± 0.05
    Moh´s Hardness 9
    Vickers Hardness (0.5 kg)1200 ± 50
    Compressive Strength (kgf-2mm)≥ 200
    Thermal Coef. Exp. (20-1000 ºC)7-8
    Al2O3 (%)≥ 93.50
    SiO2 (%)≥ 3.00
    CaO (%)≥ 1.20
    MgO (%)≥ 1.30
    Others (%)≥ 1.00
    0.25 – 0.34 mm1.4 – 1.6 mm
    0.34 – 0.44 mm1.6 – 1.8 mm
    0.4 – 0.6 mm1.8 – 2.0 mm
    0.8 – 1.2 mm2.0 – 2.5 mm
    1.2 – 1.6 mm2.5 – 3.0 mm

    Data and specifications contained in this form may be subject to any change or modification by the manufacturer without notice. In case you need any clarification or you have any query, please contact our  technical department.


    Zkr International specialized company in the manufacture and distribution of grinding media, presence in over 40 countries, introduce a new product: Alumina microespheres.

    The alumina microespheres, are made with high purity raw materials and granules of nanometric sizes, with a total absence of porosity and good fracture toughness, hardness and wear rates.

    This nanocrystalline structure gives to alumina microespheres optimal properties to be used as grinding media: high density, high hardness, high strength and low wear, being their wear ratios, fully comparable with results obtained using the Zirconium microspheres, but with more competitive price.

    Moreover, to reduce even more the grinding process costs, it should be noted that there is a difference between the packing density of both types of beads, which makes much less quantities of alumina microespheres needed to fill the mills, with consequent economic and energy savings.

    Such characteristics allow to be used in high-energy mills, where a high degree of fineness is required, so that vertical and horizontal high speed mills are used in various fields such as inks, paint, advance ceramic, mining, cosmetic, pharmacy industry,…


    • High density alumina balls ZKR 92
    • Medium-high density alumina balls ZKR 82MD
    • Medium density alumina balls ZKR 70BTC
    • High density alúmina linings ZKR92
    • Alumina linings medium – high density ZKR 82MD
    • Especial alumina wear resistance pieces
    • Alumina microespheres
    • Ceramic Proppants “LightWeight”