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Raw materials: alumina XIETA® (aluminum oxide)

Aluminum oxide, best known as Alumina, is the most used material for the production of advanced ceramics, also known as technical ceramics. Xieta International, S.L., being a worldwide well known producer and trader of technical ceramics, possess a huge knowledge in everything concerning this raw material; that’s why taking advantage of all this experience decided to start producing and distributing alumina.

Alumina production process is based on processing aluminum hydroxides from bauxites during the Bayer process. Those hydroxides are being calcinated in a continuous kiln, under a strict quality control, in order to obtain, as a result, a high chemical purity and a perfect crystalline structure; being able, therefore, giving the desired properties to the many products that use it.

Once being calcinated, our alumina goes through a dry milling process in our own mills and using our grinding media, so as to achieve high efficiency of the milling process, and a complete pollution absence in the final product.

In order to cover our different customers’ needs, we produce two different types of alumina with the following properties.

  • General Properties


    XT- 05

    XT- 0325



    · Primary Crystal Size

    3-4 microns

    1-2 microns

    · Particle Size (D50)

    80-100 microns

    5-6 microns

    Bulk Density    

    900 – 1100 kg/m3

    900 – 1100 kg/m3

    Calcination Loss (300-1000 oC)           

    0.25 %

    0.20 %

    B.E.T. (m2/g)                                                     

    1.5 – 2.0 

    3.0 – 3.5

    Oil Absorption (ml /100g)                           

    40-55 %

    15-25 %

    Hardness (Mohs)                                      



    Calcination Grade                                      



  • Chemical Composition


    XT- 05

    XT- 0325


    ≥ 99.6 %

    ≥ 99.5 %


    ≥ 93 %

    ≥ 93 %


    ≤ 0.15 %

    ≤ 0.15 %


    ≤ 0.02 %

    ≤ 0.02 %


    ≤ 0.02 %

    ≤ 0.03 %

    Data and specifications contained in this web 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.


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C/Travessera de Gràcia 62, At. 7.
08006 - Barcelona-Spain

C/Cantabria, 10 - POL INDUSTRIAL EL COLADOR, onda,
12200 - Castellon - Spain

Telf.: +34 934 147 227

Fax: +34 934 142 837

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Technical assistance milling | Technical query with our technical department.

We offer a personalized grinding technical advisory service.

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