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Carpenter Advanced Ceramics CAC998 99.8% Alumina  (discontinued **)
Categories: Ceramic; Oxide; Aluminum Oxide

Material Notes: Information provided by Carpenter Advanced Ceramics. This product line was sold to Morgan Technical Ceramics in 2008.

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 PropertiesOriginal ValueComments
Density 3.92 g/ccASTM C373
Water Absorption <= 0.0050 %ASTM C373
Particle Size 4.0 µmAverage Crystal Size
Permeability <= 1.0e-10Gas, [Torr-L/sec]; HE Leak Detection
Weibull Modulus 19ASTM C1161; ASTM C1239
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell 45 N 86
Modulus of Elasticity 386 GPaASTM C848
Flexural Strength 350 MPaASTM C1161
Compressive Strength 2410 MPaASTM C773
Poissons Ratio 0.28ASTM C848
Fracture Toughness 4.30 MPa-m½NIST Indentation
Shear Modulus 151 GPaCalculated
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 2.75e+14 ohm-cmRT; ASTM D257
 5.30e+7 ohm-cm
@Temperature 700 °C
ASTM D257
 5.00e+11 ohm-cm
@Temperature 300 °C
ASTM D257
Dielectric Constant 9.82
@Frequency 9.30e+9 Hz
ASTM D2520
Dielectric Strength 31.0 kV/mmASTM D149
Dielectric Loss Index 0.00028
@Frequency 1e+6 Hz
ASTM D150
 
Thermal PropertiesOriginal ValueComments
CTE, linear 7.70 µm/m-°C
@Temperature 40.0 - 400 °C
ASTM C372
 8.10 µm/m-°C
@Temperature 40.0 - 800 °C
ASTM C372
Specific Heat Capacity 0.791 J/g-°CASTM E1461
Thermal Conductivity 29.0 W/m-KASTM C408
 
Component Elements PropertiesOriginal ValueComments
Al2O3 99.8 %
SiO2 <= 0.010 %
 
Descriptive Properties
ColorIvory
Inclusions0 > 0.8 mm dia3x visual
Thermal Diffusivity, cm²/s0.069
Thermal Shock Resistance, (ΔT) °C250ASTM C1525

**
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