High Voltage Insulators
Electrical insulators play a substantial role in electrical power distribution. Insulator posts provide non-conductive supports that ensure safe and reliable suspension of high voltage power lines. The insulators must also be able to withstand demanding mechanical, electrical and environmental conditions.
Alumina is used in porcelain high voltage insulators to increase dielectric and mechanical strength. The alumina product should have coarse crystals in order to increase the dielectric properties, while the particle size distribution should have minimal +45um particles in order to prevent defects in the final insulator.
Almatis calcined aluminas for high voltage insulators are available in unground or continuous ground versions. Unground products need to be processed further by the user, while the continuous ground products are processed in closed circuit continuous mill-classifier processes.
The ground D50 and +45µm content are controlled to ensure a consistent particle size distribution with minimal coarse agglomerates. For sensitive insulator applications or to achieve high mechanical and dielectric strengths, we recommend the usage of our coarse-removed (CR) products..
Unground Calcined Aluminas
Primary Crystal Size = 4.0µm
Specific Surface Area = 0.40 m2/g
Na2O Content = 0.08%
Safety Data Sheet
Product Data Sheet
Primary Crystal Size = 3.0µm
Specific Surface Area = 0.40 m2/g
Na2O Content = 0.30%
Technical PaperPrimary Crystal Size = 2.7µm
Specific Surface Area = 0.50 m2/g
Na2O Content = 0.11%
Primary Crystal Size = 2.7µm
Specific Surface Area = 0.50 m2/g
Na2O Content = 0.12%
Continuous Ground Calcined Aluminas
Ground Median Size = 5.5µm
Ground Surface Area = 0.60 m²/g
Na2O Content = 0.08%
Ground Median Size = 5.5µm
Ground Surface Area = 0.60 m²/g
Na2O Content = 0.30%
Ground Median Size = 5.0µm
Ground Surface Area = 0.70 m²/g
Na2O Content = 0.30%
Ground Median Size = 5.5µm
Ground Surface Area = 0.70 m²/g
Na2O Content = 0.11%
Ground Median Size = 4.5µm
Ground Surface Area = 0.70 m²/g
Na2O Content = 0.11%
Ground Median Size = 4.8µm
Ground Surface Area = 0.70 m²/g
Na2O Content = 0.12%
Ground Median Size = 4.0µm
Ground Surface Area = 0.85 m²/g
Na2O Content = 0.12%
Ground Median Size = 3.5µm
Ground Surface Area = 0.90 m²/g
Na2O Content = 0.12%