| Physical
and Optical Properties
|
|
| Hardness |
5.5 - 6.5 Mohs' Scale 570 KHN
100
|
| Design Tensile
Strength |
4.8x107
Pa (N/mm2) (7000 psi)
|
| Design Compressive
Strength |
Greater than 1.1x109
Pa (160,000 psi)
|
| Bulk Modulus |
3.7x1010
Pa (5.3x106
psi)
|
| Rigidity Modulus |
3.1x1010
Pa (4.5x106
psi)
|
| Young's Modulus |
7.2x10-10
Pa (10.5x106
psi)
|
| Poisson's Ratio |
0.17
|
| Coefficient of
Thermal Expansion |
5.5x10-7cm/cm.°C
(20°C-320°C)
|
| Thermal Conductivity |
1.4 W/m.°C
|
| Specific Heat |
670 J/kg.°C
|
| Softening Point |
1683°C
|
| Annealing Point |
1215°C
|
| Strain Point |
1120°C
|
| Electrical
Receptivity |
7x107
ohm.cm (350°C)
|
Dielectric
Properties (20°C and 1 MHz)
Constant
Strength
Loss Factor
Dissipation Factor |
3.75
5x107
V/m
Less than 4x10-4
Less than 1x10-4
|
| Velocity of
Sound-Shear Wave |
3.75x103
m/s
|
| Velocity of
Sound/Compression Wave |
5.90x103
m/s
|
| Sonic Attenuation |
Less than 11 db/m MHz
|
Permeability
Constants (cm3mm/cm2
sec cm of Hg)
Helium
Hydrogen
Deuterium
Neon |
(700°C)
210x10-10
21x10-10
17x10-10
9.5x10-17
|
| Chemical Stability
(except hydrofluoric) |
High resistance to water and
acids
|
