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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
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PROPERTY
|
US VALUE
|
METRIC VALUE
|
|
Density
|
0.079
|
lb/in 3
|
2.2
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gr/cm 3
|
|
Flexural Strength - AB
|
13000
|
psi
|
89.6
|
mpa
|
|
Compressive Strength - AB
|
15000
|
psi
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103.4
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mpa
|
|
Compressive Strength - C
|
25000
|
psi
|
172.4
|
mpa
|
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Shear Strength - AB
|
1000
|
psi
|
6.9
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mpa
|
|
CTE - AB
|
0.8
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in/in °F x 10 -6
|
0.5
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Microns/m °C
|
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CTE - C
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11
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in/in °F x 10 -6
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6.5
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Microns/m °C
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Thermal Conductivity - AB
|
232
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BTU/(h.ft 2 °F/ft)
|
400
|
W/(m 2 . K/m)
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Thermal Conductivity - C
|
2
|
BTU/(h.ft 2 °F/ft)
|
3.5
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W/(m 2 . K/m)
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Resistivity (RT) - AB
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0.2 * 10-3
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ohm/inch
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0.5 * 10-3
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ohm/cm
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Resistivity (1650C) - AB
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0.1 * 10-3
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ohm/inch
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0.3 * 10-3
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ohm/cm
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Resistivity (RT) - C
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0.2
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ohm/inch
|
0.5
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ohm/cm
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|
Resistivity (1650C) - C
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0.1
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ohm/inch
|
0.3
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ohm/cm
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Oxidizing Atmosphere
|
1200
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°F
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649
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°C
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