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Rulon Bearings

CeramTec Rubalit® 708 Alumina, 96%
Categories: Ceramic; Oxide; Aluminum Oxide
Material Notes: Based on 96% aluminum oxide, Rubalit® 708 was developed specifically for making heavy-duty resistors and miniature metal layer resistors. Because of its outstanding strength, this same material is also used for precision wire-wound resistors.
Key Words: Al2O3, aluminum oxide
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesMetricEnglishComments
Density 3.75 g/cc0.135 lb/in³
Water Absorption 0.00 %0.00 %ASTM-C373
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell 45 N 7878ASTM-E18
Flexural Strength 420 MPa60900 psiBending Strength; ASTM-F417
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity  1.00e+8 ohm-cm
@Temperature 600 °C		1.00e+8 ohm-cm
@Temperature 1110 °F		ASTM-D1829
 1.00e+11 ohm-cm
@Temperature 400 °C		1.00e+11 ohm-cm
@Temperature 752 °F		ASTM-D1829
 1.00e+12 ohm-cm
@Temperature 200 °C		1.00e+12 ohm-cm
@Temperature 392 °F		ASTM-D257
Dielectric Strength >= 10.0 kV/mm>= 254 kV/inASTM-D149
 
Thermal PropertiesMetricEnglishComments
CTE, linear  4.40 µm/m-°C
@Temperature 20.0 - 100 °C		2.44 µin/in-°F
@Temperature 68.0 - 212 °F		ASTM-C372
 6.30 µm/m-°C
@Temperature 20.0 - 300 °C		3.50 µin/in-°F
@Temperature 68.0 - 572 °F		ASTM-C372
 7.30 µm/m-°C
@Temperature 20.0 - 600 °C		4.06 µin/in-°F
@Temperature 68.0 - 1110 °F		ASTM-C372
 8.00 µm/m-°C
@Temperature 20.0 - 1000 °C		4.44 µin/in-°F
@Temperature 68.0 - 1830 °F		ASTM-C372
Thermal Conductivity 24.0 W/m-K167 BTU-in/hr-ft²-°FASTM-C408
Maximum Service Temperature, Air 1400 °C2550 °F
 
Component Elements PropertiesMetricEnglishComments
Al2O3 96 %96 %
 
Descriptive Properties
ColorWhite
Ra = Arithmetic Mean Roughness Value (µm)0.25-0.35
Te Value (°C)900

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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