Alumina |
Designation |
Dense
AL-95 |
Dense
AL-96 |
Dense
AL-98 |
Dense
AL99.5 |
Dense
AL99.8 |
|
| % Alumina |
% Al2O3 |
95 |
96 |
98 |
99.5 |
99.8 |
|
|
|
|
|
|
|
|
Color |
|
Cream |
White or Pink |
White or Pink |
White |
Cream - White |
| Hardness |
Mohs |
9 |
9 |
9 |
9 |
9 |
| Water Absorption |
% |
Imperv |
Imperv |
Imperv |
Imperv |
Imperv |
|
Specific Gravity |
|
3.65 |
3.65 |
3.75 |
3.85 |
3.92 |
|
Crystal Spec |
Micron |
5-40 |
5-30 |
5-20 |
5-25 |
5-25 |
|
|
|
|
|
|
|
| Tensile Strength |
PSI |
20,000 |
19,000 |
22,000 |
25,000 |
25,000 |
|
Compressive Strength |
PSI |
320,000 |
300,000 |
350,000 |
375,000 |
375,000 |
| Flexural Strength |
PSI |
41,000 |
45,000 |
43,000 |
45,000 |
45,000 |
|
|
|
|
|
|
|
| Maximum Operating Temperature Under Non Loading Conditions |
°C |
1,650 |
1,700 |
1,700 |
1,675 |
1,675 |
| °F |
3,000 |
3,100 |
3,100 |
3,050 |
3,050 |
| Linear Coefficient of Thermal Expansion: |
(@ 25°C - 100 °C) x 10-6/°C |
5.8 |
6.4 |
6.4 |
6.4 |
6.4 |
| (@ 25°C - 600 °C) x 10-6/°C |
7.4 |
7.5 |
7.4 |
7.8 |
8.0 |
|
|
|
|
|
|
|
| Dielectric Strength (1/4" thick) |
VOLTS/MIL |
210 |
220 |
230 |
230 |
230 |
| Dielectric Constant |
At 25°C & 1 mhz |
9.2 |
9.3 |
9.3 |
9.7 |
9.8 |
| Loss Factor |
At 25°C & 1 mhz |
.004 |
.006 |
.004 |
.003 |
.003 |
|
|
|
|
|
|
|
|
Te Value |
Temp °C @ which one cm3 of material has a mega ohm of resistance |
840 |
840 |
940 |
1000 |
1050 |
|
NOTE: THE INFORMATION IN THIS DATA SHEET IS FOR DESIGN GUIDANCE ONLY. FORMING METHODS AND SPECIFIC GEOMETRY COULD AFFECT PROPERTIES. SLIGHT ADJUSTMENTS CAN BE MADE TO SOME OF THE PROPERTIES TO ACCOMMODATE SPECIFIC CUSTOMER REQUIREMENTS. MOST OF THE DENSE MATERIALS IN THE TABLE ARE RESISTANT TO MECHANICAL EROSION AND CHEMICAL ATTACK. |
