|
|
| Thermal properties |
|
|
|
| Linear Thermal
Expansion Coefficient |
5.7
x 10-7 cm/(cm.°C) ( 20°C
- 320°C)
|
| Softening Point |
1600 ± 25°C |
| Strain Point |
1000 ± 20°C |
| Annealing Point |
1100 ± 20°C |
| Max Service
Temperature |
1150°C - continuous
1300°C – limited time |
| Thermal Conductivity |
1.38 W/(m.°C) |
| Specific Heat |
0.177 cal/gm°C |
| Thermal Diffusion |
7.5
x 10-3 cm2/sec
|
|
|
| Mechanical
properties |
|
|
|
| Density |
2.20 g/cm3 |
| Young’s Modulus |
71.7 GPa |
| Bulk’s Modulus |
37 GPa |
| Shear Modulus |
31 GPa |
| Knoop Hardness |
500 kg/mm2 |
| Rupture Resistance |
50 MPa @ 25°C |
| Poisson’s ratio |
0.17 @25°C |
|
|
| Electrical
properties |
|
|
|
| Electrical
Resistivity |
> 1018 Ω x m |
| Dielectric Strength |
250 - 400 kV/cm @ 20°C |
| Dielectric constant |
3,75 @ 20°C 1 MHz |
| Resistivity |
7 x 107ohm-cm @350°C |
|
|
| Optical properties |
|
|
|
| Transmission |
Please see the graph below |
| Refractive Index |
1.45840 @ 589.3nm |
|
|
|
Transmission
Curve
|
|
|
|
