Vitreous Carbon Substrate
Our PYROID® pyrolytic graphite is a very light weight, 5'9's pure, solid crystal composition, with no granular components, extremely smooth surface, capable of withstanding cryogenic temperatures as well as temperatures in excess of 3,000°C
The material is extremely anisotropic, meaning it conducts heat and electricity in the a-b plane like copper but acts like a ceramic in the normal direction. In an annealed state, the thermal and conduction properties increase up to four to eight times that of aluminum and copper respectively.
The material has zero porosity making it extremely stable and exhibits no outgassing. It is ideal for use in corrosive environments including acids and chlorine, and is highly transparent to organic samples and electrons, for analytical work, such as x-ray investigation, metallurgical, crystal growth, medical imaging technology, etc.
Physical Properties of PYROID® Pyrolytic Graphite
| Property |
Direction* |
Metric Units |
English Units |
| Density |
----- |
2.22 g/cc |
1.37 lb/ft3 |
| Flexual Strength |
|
|
|
| Room Temperature |
a |
840 kg/cm2 |
12,000 psi |
| 2750°C |
a |
3,500 kg/cm2 |
50,000 psi |
| Compressive Strength |
|
|
|
| Room Temperature |
a |
1,050 kg/cm2 |
15,00 psi |
| |
c |
1,750 kg/cm2 |
25,000 psi |
| Shear Strength |
|
|
|
| Room Temperature |
a |
70 kg/cm2 |
1,000psi |
| Coefficient Thermal Expansion |
|
|
|
| Room Temperature |
a |
.60 x 10-6 cm/cm°C |
1.0 x 10-6 in/in°F |
| 2200°C |
a |
.68 x 10-6 cm/cm°C |
1.2 x 10-6 in/in°F |
| Room Temperature |
c |
6.8 x 10-6 cm/cm°C |
12.0 x 10-6 in/in°F |
| 2200°C |
c |
8.0 x 10-6 cm/cm°C |
14.7 x 10-6 in/in°F |
| Thermal Conductivity |
|
|
|
| Room Temperature |
a |
345 W/m°K |
200 BTU/(hr ft2)(°F/ft) |
| 1650°C |
a |
114 W/m°K |
66 BTU/(hr ft2)(°F/ft) |
| Room Temperature |
c |
1.73 W/m°K |
1.00 BTU/(hr ft2)(°F/ft) |
| 3000°F |
c |
1.30 W/m°K |
0.75 BTU/(hr ft2)(°F/ft) |
| Electric Resistivity |
|
|
|
| Room Temperature |
a |
500 µΩcm |
|
| 1650°C |
a |
200 µΩcm |
|
| Room Temperature |
c |
0.6 Ωcm |
|
| 1650°C |
c |
0.22 Ωcm |
|
| Scleroscope Hardness |
a |
103 |
103 |
| |
c |
68 |
68 |
| Oxidation Threshold |
|
650°C |
1200°F |
| Permeability |
|
Helium Leak Tight
at 10 – 6 mmHg |
|
Pyrolytic Graphite Planchet for SEM
Surface polish to 1 µm glassy finish