Insulators – Aluminum Oxide
Aluminum Oxide
Aluminum oxide has unique thermal conductivity qualities
and features low loss factors at high frequencies. It has high
compressive strength, high volume resistivity, low thermal
expansion and resists radiation.
PROPERTY
A1 0
2 3
CHEMICAL – TYPICAL VALUE
94% nominal
TEST METHOD
Spectrographic analysis
(100%-% by wt. of total
metallic impurity)
Dielectric constant 25‚°C (77°F)
Dissipation factor 25°C (77°F)
ELECTRICAL
8.9 (1MHz)
Aluminum oxide insulating washers have a dielectric strength
of approximately 21.7 x 103 volts/mm for .76mm material (550
volts/mil for 0.030 inch material) and 16.9 x 103 volts/mm for
1.57mm material (430 volts/mil for 0.062 inch material). The
thermal conductivity of aluminum oxide is 15.06W/(m°C) at 75°C.
ASTM D150-70
ASTM D2520-70
ASTM D150-70
ASTM D2520-70
ASTM D1829-66
ASTM D116-69
8.9 (10GHz)
0.0001 (MHz)
0.0010 (10GHz)
>1014 ohm-cm
Electrical resistivity 25°C (77°F)
Dielectric strength (AC)
8.66 x 103 volts/mm (6.35mm thick)
[220 volts/mil (0.250”thick)]
16.73 x 103 volts/mm (1.27mm thick)
[425 volts/mil (0.050”thick)]
28.35 x 103 volts/mm (0.25mm thick)
[720 volts/mil (0.010”thick)]
PHYSICAL
Density
3.62 g/cm3 (226 lb/ft3)
ASTM C20-70
ASTM E18-67
Hardness
78 (Rockwell 45 N)
MECHANICAL
Flexural strength 25°C (77°F)
3.17 x 108 Pa (minimum) [46.00 psi (minimum)]
3.52 x 108 Pa (typical) [51,000 psi (typical)]
2.83 x 1011 Pa (41 x 106 psi)
0.21
1.93 x 108 Pa (28,000 psi)
2.10 x 109 Pa (305,000 psi)
THERMAL
ACMA Test #2
Modules of elasticity
ASTM C623-69T
ASTM C623-69T
ACMA Test #4
Poisson’s ratio
Tensile strength 25°C (77°F)
Compressive strength 25°C (77°F)
ASTM C528-63T
Coefficient of thermal expansion
Thermal conductivity
7.9 x 106/°C (4.4 x 106/°F)
18.01 W/(m°C) @ 25°C
14.24 W/(m°C) @ 100°C
79.56 W/(m°C) @ 400°C
8.79 x 104 KJ/kg°C [2.1 x 104 Btu/lb °F]
>3600°C (6512°F)
ASTM C372-56
ASTM C408-58
Specific heat (100°C)
Melting point
ASTM C351-61
Maximum temperature for
continuous use
1700°C (3100°F)
"C" RAD
TYP (2)
Aluminum Oxide for TO-3
3.68
(0.145)
"A"
1.83
(0.072)
TYP (4)
DIA
ORDERING INFORMATION
Part number Thickness
“A” Dim
“B” Dim
“C” Dim
“D” Dim
“E” Dim
4103G*
4104G*
1.91 (0.075) 39.70 (1.563) 26.67 (1.050) 13.34 (0.525) 4.75 (0.187) 30.40 (1.197)
1.78 (0.070) 44.45 (1.750) 31.75 (1.250) 15.88 (0.625) 7.16 (0.282) 30.15 (1.187)
10.92
"B"
5.46
(0.215)
(0.430)
"D"
RAD
TYP (2)
15.09
(0.594)
"E"
"D"
Aluminum Oxide Ceramic for TO-220
"C"
ORDERING INFORMATION
Part number Thickness
“A” Dim
“B” Dim
“C” Dim
“D” Dim
“E” Dim
4169G*
4170G**
4171G**
4177G**
1.57 (0.062) 19.30 (0.760) 13.97 (0.550) 4.78 (0.188) 6.98 (0.275) 3.68 (0.145)
1.78 (0.070) 19.30 (0.760) 13.97 (0.550) 4.78 (0.188) 6.98 (0.275) 3.68 (0.145)
1.78 (0.070) 16.51 (0.650) 12.70 (0.500) 4.32 (0.170) 6.35 (0.250) 3.81 (0.150)
1.78 (0.070) 17.45 (0.687) 14.27 (0.562) 5.54 (0.218) 7.14 (0.281) 3.18 (0.125)
"A"
"E"
DIA
"B"
"B"
Aluminum Oxide Ceramic for TO-218, TO-247, and TO-3P
"D"
ORDERING INFORMATION
Part number
Thickness
“A” Dim
“B” Dim
“C” Dim
“D” Dim
“E” Dim
4180G*
1.78 (0.070) 23.24 (0.915) 18.80 (0.740) 6.98 (0.275) 9.40 (0.370) 3.96 (0.156)
"A"
"C"
"E"
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