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Alumina

Alumina (aluminium oxide, Al2O3) offers a combination of good mechanical properties and electrical insulation and is suitable for use in a wide range of applications.

Alumina componentsAlumina (or aluminium oxide, Al2O3) is the most widely used advanced ceramic in the world. It combines good hardness and corrosion resistance with reasonable strength and can be used in applications up to 1700C.

Alumina is available in a range of purities. The high purity ceramics offered by International Syalons are especially suitable for wear and corrosion resistant applications. In addition they offer excellent electrical properties and possess good thermal stability.

ISN offer three fully dense grades of alumina, Aluminon 96, Aluminon 995 and Aluminon 999. The properties of these materials are outlined below.

Aluminon 96

Aluminon 96 is fully dense and suitable for wear and corrosion resistant applications. The table below lists typical mechanical, thermal and electrical property data for Aluminon 96.

Physical property data for Aluminon 96

Property Value Units
Composition 96% Al2O3 -
Density 3.75 g/cc
Porosity 0 %
3 point Modulus of Rupture 20°C
(Specimen 3 × 3 × 50mm, span 19.05mm)
300 MPa
3 point Modulus of Rupture 1000°C 200 MPa
Weibull Modulus 10 -
Compressive Strength >2000 MPa
Young's Modulus of Elasticity 330 GPa
Poisson's Ratio 0.22 -
Hardness (HR45N) 83 -
Hardness (Vickers Hv50) 15.71 (1600) GPa (Kg/mm2)
Fracture Toughness K1C 3.5 MPa m½
Thermal Expansion Coefficient (0-1200°C) 7.0X10-6 K-1
Thermal Conductivity 20.0 W/(mK)
Thermal Shock Resistance 200 ΔT°C quenched in cold water
Maximum Use Temperature 1600 °C
Electrical Resistivity 1015 ohm cm

Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.

Download the Aluminon 96 Property Data Sheet PDF (0.17 Mb).

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Aluminon 995

Aluminon 995 is fully dense and has excellent corrosion resistance. In addition, it has excellent thermal stability up to 1700°C and can be used as noble metal thermocouple protection tubes. The table below lists typical mechanical, thermal and electrical property data for Aluminon 995.

Physical property data for Aluminon 995

Property Value Units
Composition 99.5% Al2O3 -
Density 3.89 g/cc
Porosity 0 %
3 point Modulus of Rupture 20°C
(Specimen 3 × 3 × 50mm, span 19.05mm)
330 MPa
3 point Modulus of Rupture 1000°C 250 MPa
Weibull Modulus 15 -
Compressive Strength >2000 MPa
Young's Modulus of Elasticity 370 GPa
Poisson's Ratio 0.22 -
Hardness (HR45N) 82 -
Hardness (Vickers Hv50) 15.71 (1600) GPa (Kg/mm2)
Fracture Toughness K1C 4.0 MPa m½
Thermal Expansion Coefficient (0-1200°C) 7.8X10-6 K-1
Thermal Conductivity 30.0 W/m/K
Thermal Shock Resistance 200 ΔT°C quenched in cold water
Maximum Use Temperature 1700 °C
Electrical Resistivity 1015 ohm cm

Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.

Download the Aluminon 995 Property Data Sheet PDF (0.13 Mb).

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Aluminon 999

Aluminon 999 is a very high purity material with excellent mechanical, thermal and corrosion resistant properties. It is the most stable of our aluminas and is suitable for severe wear and corrosion applications. The table below lists typical mechanical, thermal and electrical property data for Aluminon 999.

Physical property data for Aluminon 999

Property Value Units
Composition 99.9% Al2O3 -
Density 3.95 g/cc
Porosity 0 %
3 point Modulus of Rupture 20°C
(Specimen 3 × 3 × 50mm, span 19.05mm)
500 MPa
3 point Modulus of Rupture 1000°C 300 MPa
Weibull Modulus 15 -
Compressive Strength >2500 MPa
Young's Modulus of Elasticity 400 GPa
Poisson's Ratio 0.22 -
Hardness (HRA) 92 -
Hardness (Vickers Hv50) 17.65 (1800) GPa (Kg/mm2)
Fracture Toughness K1C 4.5 MPa m½
Thermal Expansion Coefficient (0-1200°C) 8.5X10-6 K-1
Thermal Conductivity 30.0 W/m/K
Thermal Shock Resistance 220 ΔT°C quenched in cold water
Maximum Use Temperature 1700 °C
Electrical Resistivity 1015 ohm cm

Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.

Download the Aluminon 999 Property Data Sheet PDF (0.13 Mb).

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The successful integration of advanced technical ceramics into engineering systems requires close collaboration between you, the end-user, and ourselves, the material suppliers. Please contact our Technical Department to discuss your requirments in detail and assist in exploiting the significant advantages which our advanced ceramics offer.

In addition, see our resources section for guides on designing with ceramics and more property data comparing Aluminon ceramics with other engineering ceramics. For a comparison of the physical properties of all our materials see our Material Properties Datasheet.