|
|
| ELECTRICAL & MECHANICAL DATA |
Data Figures Are After Firing
|
| TYPE OF MATERIAL |
LAVA |
| Machined from Natural Stone |
| PROPERTY |
TEST METHOD |
UNIT |
GRADE "A" Aluminum Silicate |
GRADE "M" Magnesium Silicate |
| Water Absorption |
ASTM D116-42A |
% |
2.5 |
0.97 |
| Specific Gravity |
|
|
2.3 |
2.8 |
| Density |
|
lbs.per |
0.085 |
0.1 |
| Color |
|
|
Pink |
Brown |
| Hardness |
|
Mohs' Scale |
6 |
6 |
| Tensile Strength |
ASTM D116-42 |
lbs.per sq.in |
3,000 |
2,600 |
| Compressive Strength |
ASTM D667-42T |
lbs.per sq.in |
25,000 |
30,000 |
| Flexural Strength |
ASTM D667-42T |
lbs.per sq.in |
10,000 |
11,000 |
| Softening Temperature |
|
C° / F° |
1,600 / 2,912 |
1,475 / 2,687 |
| Linear Coefficient of Thermal Expansion 25-100°C/25-600°C |
|
per C° |
 |
 |
| Te Value |
|
C° |
700 |
750 |
Dielectric Strength
(Step 60 cycles) |
ASTM D667-42T |
volts per mil |
100 |
100 |
| Dielectric Constant |
Jan-1-10 |
at 1 MC |
5.3 |
5.5 |
| Power Factor |
Jan-1-10 |
at 1 MC |
0.01 |
0.006 |
| Loss Factor |
Jan-1-10 |
at 1 MC |
0.053 |
0.033 |
| PRINCIPAL USES |
|
|
Machined parts with close tolerances and good dielectric properties. Very low coefficient of thermal expansion. Can be supplied in larger sizes than other grades of Lava. |
Machined parts for Electrical Equipment and Appliances where close tolerances are required. |
LASER FLASH THERMAL CONDUCTIVITY RESULTS
|
| |
bulk density |
temperature |
temperature |
specific heat |
diffusivity |
conductivity |
| |
p@25°C |
|
|
Cp |
 |
 |
| Sample |
(g/cm³) |
(°C) |
(°F) |
(J/gK) |
(cm²/s) |
(W/mK) |
|
Grade A Lava-
Hard |
2.38 |
1204 |
2200 |
1.42 |
0.00687 |
2.32 |
Grade A Lava-
Req. |
2.31 |
1093 |
2000 |
1.39 |
0.00619 |
1.98 |
L-3 Steatite |
2.19 |
1204 |
2200 |
1.53 |
0.00638 |
2.14 |
|
|
