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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

  PROPERTY

US VALUE

METRIC VALUE

  Density

0.079

  lb/in 3

2.2

  gr/cm 3

  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.ft 2 °F/ft)

400

  W/(m 2 . K/m)

  Thermal Conductivity - C

2

  BTU/(h.ft 2 °F/ft)

3.5

  W/(m 2 . 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

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