Pyrolytic Graphite is a unique form of graphite manufactured by decomposition of a hydrocarbon gas at very high temperature in a vacuum furnace. It is nucleated on substrate and grown with texture along C axis . The result is an ultra-pure product which is near theoretical density and extremely anisotropic. The material is grown onto a substrate giving it a layered composition. This also means it has different properties in different planes. In the C plane (across its layers) it has low thermal conductivity, acting as an insulator. In the A-B plane (with the layers) it has very high thermal conductivity, acting as a superb conductor. All values are taken at room temperature, unless noted otherwise.
Typical Properties
|
PROPERTY |
US VALUE |
METRIC VALUE |
||
|
Density |
0.079 |
lb/in3 |
2.2 |
gr/cm3 |
|
Flexural Strength - AB |
13000 |
psi |
89.6 |
mpa |
|
Compressive Strength - AB |
15000 |
psi |
103.4 |
mpa |
|
Compressive Strength - C |
25000 |
psi |
172.4 |
mpa |
|
Shear Strength - AB |
1000 |
psi |
6.9 |
mpa |
|
CTE - AB |
0.8 |
in/in °F x 10-6 |
0.5 |
Microns/m °C |
|
CTE - C |
11 |
in/in °F x 10-6 |
6.5 |
Microns/m °C |
|
Thermal Conductivity - AB |
232 |
BTU/(h.ft2°F/ft) |
400 |
W/(m2. K/m) |
|
Thermal Conductivity - C |
2 |
BTU/(h.ft2°F/ft) |
3.5 |
W/(m2. K/m) |
|
Resistivity (RT) - AB |
0.2 * 10-3 |
ohm/inch |
0.5 * 10-3 |
ohm/cm |
|
Resistivity (1650C) - AB |
0.1 * 10-3 |
ohm/inch |
0.3 * 10-3 |
ohm/cm |
|
Resistivity (RT) - C |
0.2 |
ohm/inch |
0.5 |
ohm/cm |
|
Resistivity (1650C) - C |
0.1 |
ohm/inch |
0.3 |
ohm/cm |
|
Oxidizing Atmosphere |
1200 |
°F |
649 |
°C |