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Calcined Alumina

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Calcined alumina SALOX® are aluminium oxides, which are manufactured with the calcination of alumina or aluminium hydroxide. Precise management of the calcination process and further mechanical treatment ensure that Silkem offers high-quality products with the required properties.
The preparation of the input raw materials enables a diversification of products according to chemical properties. Various calcination stages are used to produce SALOX® products, which differ in terms of α-Al2O3 content, the size of primary crystals and the morphology of the material, which consequently leads to differences in the specific surface area of products. Grinding and separation techniques are used to ensure a broad range of final products with different distributions of particle sizes.
  • Its specific properties make alumina one of the most commonly used oxides in the refractory industry. It is a component part of various types of concrete, bricks, monolithic products, insulation materials and other products.

  • In the ceramics industry, calcined alumina is used as a product’s component and for the glaze. Due to their excellent insulation properties, special types of alumina with low alkali content are used in the manufacturing of electro ceramics.

Calcined Aluminas SALOX®

Type of Product100S15VLS15M-1M-S1
Old Product Code GKM GKT GKT-VLS GKE GKE-V
Al2O3* % min. 99.3 min. 99.3 min. 99.7 min. 99.3 min. 99.5
Na2O total % max. 0.40 max. 0.30 max. 0.05 max. 0.40 max. 0.30
Fe2O3 % max. 0.05 max. 0.05 max. 0.05 max. 0.05 max. 0.03
SiO2 % max. 0.05 max. 0.05 max. 0.03 max. 0.05 max. 0.03
CaO % max. 0.05 max. 0.05 max. 0.05 - max. 0.04
α-Al2O3 % - min. 70** - min. 95** min. 95**
Loss on ignition (L.O.I.) % - max. 0.5 - max. 0.3 max. 0.2
Specific surface area (BET) m2/g 75 3 - 10 4 - 8 0.3 - 0.6 max. 1
Primary crystal size µm - - - 2.0 - 3.5 2.0 - 4.5
Average particle size d50  µm 60 - 80 45 - 85 60 - 80 70 70
Bulk density kg/m3 950 950 950 900 900

* By difference
** Only for information

Ground Calcined Aluminas SALOX®

Type of Product S15SGM-1FGM-S1FGVLS-15SGM-MS1FG
Old Product Code   GKT-SG GKE-MF ALO-G4-4G  GKT-VLS-SG  
Al2O3 * % min. 99.3 min. 99.3 min. 99.5  min. 99.7  min. 99.7
Na2O total % max. 0.30 max. 0.40 max. 0.30  max. 0.05  max. 0.20
Fe2O3 % max. 0.07 max. 0.05 max. 0.04  max. 0.07  max. 0.05
SiO2 % max. 0.05 max. 0.05 max. 0.04  max. 0.05  max. 0.05
CaO % max. 0.05 - max. 0.04  max. 0.05  -
Loss on ignition (L.O.I.) % - max. 0.3 max. 0.3  -  max. 0.3
Specific surface area (BET) m2/g 5 - 11 0.6 - 1 max. 1.3  5 - 11  max. 1.5
Average particle size d50 µm 1 - 4 4 - 6 4 - 7  2 - 4  4 - 6
+ 45 mm (wet sieve) % 5 3  -  0 - 5  0 - 3

New SALOX® designation

Calcination with Mineralizator
  No
M- Yes
Sodium content (%)
    Na2O < 0,40%
S Sodium 0,20% < Na2O < 0,30%
MS Medium S.. 0,10% < Na2O < 0,20%
LS Low S. 0,05% < Na2O < 0,10%
VLS Very low S. Na2O < 0,05%
Specific Surface - BET (m2/g)
200 100 - 200 (m2/g)
100 50 - 100 (m2/g)
50 15 - 50 (m2/g)
15 10 - 15 (m2/g)
10 6 - 10 (m2/g)
6 1 - 6 (m2/g)
1 max. 1 (m2/g)
Average particle size - D50 (µm)
Ground G 10-40 µm
Medium Ground MG 7-10 µm
Fine Ground FG 4-6 µm
Super Ground SG 2-4 µm
Reactive R 0.5-2 µm
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