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Elmet Technologies

Mullite, 3Al2O3-2SiO2
Categories: Ceramic; Oxide; Aluminum Oxide; Silicon Oxide

Material Notes:

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Physical PropertiesMetricEnglishComments
Density 2.80 g/cc0.101 lb/in³ASTM C20
Water Absorption 0.00 %0.00 %ASTM C373
 
Mechanical PropertiesMetricEnglishComments
Knoop Microhardness 14501450kg/mm²
Hardness, Rockwell 45 N 7070
Modulus of Elasticity 150 GPa21800 ksiASTM C848
Flexural Strength 170 MPa24700 psiASTM F417
Compressive Strength 550 MPa79800 psiASTM C773
Poissons Ratio 0.250.25ASTM C848
Shear Modulus 60.0 GPa8700 ksiCalculated
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 1.00e+13 ohm-cm1.00e+13 ohm-cmASTM D1829
 300000 ohm-cm
@Temperature 1000 °C
300000 ohm-cm
@Temperature 1830 °F
ASTM D1829
 5.00e+12 ohm-cm
@Temperature 500 °C
5.00e+12 ohm-cm
@Temperature 932 °F
ASTM D1829
Dielectric Constant 6.56.5
Dielectric Strength 9.80 kV/mm249 kV/inASTM D116
Dissipation Factor 0.00200.0020ASTM D2520
 
Thermal PropertiesMetricEnglishComments
CTE, linear  5.00 µm/m-°C
@Temperature 20.0 °C
2.78 µin/in-°F
@Temperature 68.0 °F
 5.00 µm/m-°C
@Temperature 250 °C
2.78 µin/in-°F
@Temperature 482 °F
 5.00 µm/m-°C
@Temperature 500 °C
2.78 µin/in-°F
@Temperature 932 °F
 5.30 µm/m-°C
@Temperature 1000 °C
2.94 µin/in-°F
@Temperature 1830 °F
ASTM C372
Specific Heat Capacity 0.950 J/g-°C0.227 BTU/lb-°FASTM E1269
Thermal Conductivity 3.50 W/m-K24.3 BTU-in/hr-ft²-°FASTM C408
Melting Point 1880 °C3420 °F
 
Optical PropertiesMetricEnglishComments
Refractive Index 1.641.64
IR Transmittance 85 %
@Thickness 0.220 mm
85 %
@Thickness 0.00866 in
cutoff is 4.8 µm.
 
Processing PropertiesMetricEnglishComments
Sintering Temperature 1620 °C2950 °F

References for this datasheet.

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BMULL0 / 250

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