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Alumina
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Strength Properties
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Fastener Properties - Alumina
Property
Unit
A998
PSZ
Physical
Composition ¹
weight %
99.8 Al
2
O
3
5.4 Y
2
O
3
Density ²
g/cm3
3.89
6.0
Porosity
volume %
Impervious
Impervious
Color
Ivory
Off-white
Mechanical
Hardness
GPa (Knoop)
11.1
11.7
4-point Bend ³ Strength (MOR)
MPa
(ksi)
325
(47)
600
(87)
Thermal
Maximum Service Temperature
°C
1650
2200
Thermal Expansion
Coefficient
°C
-1
(25-700°C)
7.5 ´10
-6
11.2 ´10
-6
Thermal Conductivity (20°C)
W/m·°K (Btu·in/ft2 ·hr·°F)
35
(242)
2
(14)
Electrical
Dielectric Strength
Volts/mil
200
51
Dielectric Constant
@1MHz @ 20°C
10.0
28.0
Volume Resistivity
Ohm·cm @ 25°C
Ohm·cm @ 300°C
Ohm·cm @ 500°C
14
2.5x1011
5.5x10
>10
13
n/a
48.10
3
¹ Controlled by the Batch Composition
² Measured by Pychnometer Immersion Technique
³ per ASTM C 1161 – 02c.
Rev 10/2006
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