Spark Plugs
Spark plugs are a critical part of ignition systems in internal combustion engines and industrial applications. As the voltage differential between the electrodes exceeds the dielectric breakdown voltage of the gases in the chamber, the gases ionize and a spark is generated. The spark ignites the fuel/air mixture and typically facilitates a thermo-mechanical energy conversion.
Alumina is used in the insulator, which insulates the central electrode and must have a high dielectric strength. As ignition technology evolves with a focus on energy efficiency, the spark plug is being subjected to higher voltages while the geometry is becoming increasingly elongated. These increased demands require a more robust insulator with thinner walls and higher dielectric strengths.
Almatis calcined aluminas for spark plug applications include coarse, medium and fine crystalline products with intermediate and low Na2O levels. These products are easily processed in wet or dry grinding systems and provide tight shrinkage characteristics for the insulator body.
From standard bodies to high performance insulators, Almatis aluminas have consistently met the ever-tightening industry requirements of thinner walls and higher dielectric strengths for over 50 years.
Unground Calcined Aluminas
Primary Crystal Size = 4.8µm
Specific Surface Area = 0.20 m2/g
Na2O Content = 0.08%
Safety Data Sheet
Product Data Sheet
Primary Crystal Size = 4.1µm
Specific Surface Area = 0.30 m2/g
Na2O Content = 0.06%
Primary Crystal Size = 1.8µm
Specific Surface Area = 0.70 m2/g
Na2O Content = 0.06%
Primary Crystal Size = 1.7µm
Specific Surface Area = 0.90 m2/g
Na2O Content = 0.06%
Primary Crystal Size = 1.1µm
Specific Surface Area = 1.2 m²/g
Na2O Content = 0.06%
Primary Crystal Size = 2.7µm
Specific Surface Area = 0.50 m2/g
Na2O Content = 0.12%
Primary Crystal Size = 2.0µm
Specific Surface Area = 0.60 m2/g
Na2O Content = 0.12%
Primary Crystal Size = 1.7µm
Specific Surface Area = 0.70 m2/g
Na2O Content = 0.12%
Technical PaperContinuous Ground Calcined Aluminas
Ground Median Size = 8.0µm
Ground Surface Area = 0.50 m²/g
Na2O Content = 0.08%
Ground Median Size = 4.2µm
Ground Surface Area = 0.90 m²/g
Na2O Content = 0.06%
Ground Median Size = 3.9µm
Ground Surface Area = 0.90 m²/g
Na2O Content = 0.06%
Ground Median Size = 3.5µm
Ground Surface Area = 0.90 m²/g
Na2O Content = 0.12%
Ground Median Size = 3.4µm
Ground Surface Area = 1.0 m²/g
Na2O Content = 0.12%
Batch Ground Reactive Aluminas
Ground Median Size = 0.4µm
Ground Surface Area = 8.8 m²/g
Na2O Content = 0.07%
Ground Median Size = 0.4µm
Ground Surface Area = 7.5 m²/g
Na2O Content = 0.08%
Ground Median Size = 1.2µm
Ground Surface Area = 4.3 m²/g
Na2O Content = 0.06%
Ground Median Size = 1.4µm
Ground Surface Area = 3.1 m²/g
Na2O Content = 0.06%
Ground Median Size = 3.1µm
Ground Surface Area = 1.1 m²/g
Na2O Content = 0.06%