| Mechanical and Electrical Properties of Ceramic Materials |
| Property/Unit |
Steatite |
Forsterite |
Alumina
96% AL203 |
Cordierite |
Magnesium Oxide |
Aluminum
Silicate |
| Material Grade |
DC-9
L-3 |
DC-10
L-3 |
DC-16
L-3 |
DC-144
L-5 |
DC-200
L-5 |
DC-265
L-6 |
DC-65 |
DC-187 |
DC-142 |
| Water Absorption (%) |
Impervious
0.0-0.02 |
Semi-porous
1.0-3.0 |
Impervious
0.0-0.2 |
Impervious
0.0-0.2 |
Impervious
0.0-0.2 |
Impervious
0.0 |
Porous
1.0-5.0 |
Porous
15-20 |
Porous
15-20 |
| Density (lbs/in3) |
0.094 |
0.090 |
0.094 |
0.098 |
0.101 |
0.134 |
0.076 |
.076-.090 |
0.072 |
| Specific Gravity (g/cc) |
2.6 |
2.5 |
2.6 |
2.7 |
2.8 |
3.7 |
2.1 |
2.1-2.5 |
2.0 |
| Color |
Off-White |
Off-White |
Off-White |
Off-White |
Cream |
White |
Off-White |
Off-White |
Off-White |
| Thermal Conductivity (k) Watts/(Meter)(C°) |
3.4
(0.008) |
3.4
(0.008) |
3.4
(0.008) |
3.4
(0.008) |
3.8
(0.009) |
18.0
(0.045) |
3.4
(0.008) |
----
---- |
----
---- |
| Hardness (Mohs' Scale) |
7.5 |
7.5 |
7.5 |
7.5 |
7.5 |
9.0 |
7.5 |
---- |
---- |
Flexural Strength
(1000 Pounds per Sq. In.) |
18 |
17.5 |
18 |
20 |
20 |
60 |
14 |
1.5 |
3.5 |
| Compressive Strength (1000 Pounds per Sq. In.) |
80 |
75 |
80 |
90 |
85 |
400 |
70 |
2.5 |
6 |
| Tensile Strength (1000 Pounds per Sq. In.) |
8.5 |
8 |
8.5 |
9 |
9 |
25 |
7 |
---- |
---- |
| Coefficient of Thermal Expansion Per °C (20° - 650°C) |
8.0x10-6 |
8.2x10-6> |
8.39x10-6 |
8.4x10-6 |
9.9x10-6 |
7.9x10-6 |
2.9x10-6 |
---- |
---- |
| Resistance to Impact (Inch - Pounds) |
5 |
4.7 |
5 |
5.3 |
5.1 |
7 |
4.5 |
---- |
---- |
Safe Operating Temperature
°C
°F |
1000
1832 |
1000
1832 |
1000
1832 |
1000
1832 |
1000
1832 |
1550
2822 |
1100
2012 |
----
---- |
----
---- |
| Dielectric Strength (Volts per mil) |
230 |
220 |
230 |
240 |
250 |
230 |
180 |
---- |
---- |
Te Value
°C
°F |
850
1562 |
800
1472 |
850
1562 |
900
1652 |
1020
1868 |
840
1544 |
750
1382 |
1100
2012 |
800
1472 |
| Dielectric Constant (at 1 Megacycle/Sec.) |
5.5 |
5.9 |
5.5 |
6.2 |
6.4 |
9.3 |
6.0 |
---- |
---- |
| Power Factor (at 1 megacycle/Sec.) |
0.005 |
0.0046 |
0.005 |
0.0012 |
0.0011 |
0.0003 |
0.008 |
---- |
---- |
| Loss Factor (at 1 Megacycle/Sec.) |
0.028 |
0.027 |
0.028 |
0.007 |
0.007 |
0.0028 |
0.048 |
---- |
---- |
