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Alumina, alpha Al2O3, 99.5%
Categories: Ceramic; Oxide; Aluminum Oxide

Material Notes: Property values below are taken from literature and manufacturer sources. Variations are possible among various commercial grades.

Key Words: aluminum oxide, corundum
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Physical PropertiesMetricEnglishComments
Density 3.90 g/cc0.141 lb/in³
Water Absorption 0.00 %0.00 %
 
Mechanical PropertiesMetricEnglishComments
Hardness, Mohs 9.09.0
Tensile Strength, Ultimate 260 MPa37700 psi
Modulus of Elasticity 370 GPa53700 ksi
Flexural Strength 350 MPa50800 psi
Compressive Strength 2600 MPa377000 psi
Poissons Ratio 0.220.22
Fracture Toughness 4.00 MPa-m½3.64 ksi-in½
Shear Modulus 140 GPa20300 ksi
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 1.00e+14 ohm-cm1.00e+14 ohm-cm
Dielectric Constant 9.79.7
Dielectric Strength 9.00 kV/mm229 kV/inWide Variation Between Grades
 
Thermal PropertiesMetricEnglishComments
CTE, linear  7.60 µm/m-°C
@Temperature 25.0 - 400 °C
4.22 µin/in-°F
@Temperature 77.0 - 752 °F
 8.20 µm/m-°C
@Temperature 20.0 - 1000 °C
4.56 µin/in-°F
@Temperature 68.0 - 1830 °F
Specific Heat Capacity 0.880 J/g-°C0.210 BTU/lb-°F
Thermal Conductivity 30.0 W/m-K208 BTU-in/hr-ft²-°F
 12.0 W/m-K
@Temperature 400 °C
83.3 BTU-in/hr-ft²-°F
@Temperature 752 °F
 26.0 W/m-K
@Temperature 100 °C
180 BTU-in/hr-ft²-°F
@Temperature 212 °F
Maximum Service Temperature, Air 1700 °C3090 °FNo Load
 
Component Elements PropertiesMetricEnglishComments
Al2O3 99.5 %99.5 %

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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BA5A / 143

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