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Rulon Bearings

Momentive Performance Materials "PG" Pyrolytic Graphite
Categories: Carbon; Graphite

Material Notes: Pyrolytic Graphite (PG) is a unique form of graphite manufactured by decomposition of a hydrocarbon gas at very high temperature in a vacuum furnace. The result is an ultra-pure product which is near theoretical density and extremely anisotropic. This anisotropy results from the layered structure. As an example, PG exhibits a thermal conductivity consistent with the best conductors in the "AB" plane and lower than alumina brick in the "C" direction. Mechanical thermal, and electrical properties are generally far superior to conventional graphites. Typical properties are listed below. PG is Available as plate, free-standing shapes (crucibles, boats, tubes, etc.), and as an impermeable coating on graphite and other substrates.

APPLICATIONS:

  • Sputtering Targets
  • Ion Beam Grids
  • Ion Implant Hardware
  • Liquid Phase Epitaxy Hardware
  • Crucibles for Ultra High Vacuum
  • Thermal Insulators
  • Rocket Nozzles
  • Heater Elements

Information provided by Momentive Performance Materials, formerly GE Advanced Ceramics.

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Physical PropertiesMetricEnglishComments
Density 2.18 - 2.22 g/cc0.0788 - 0.0802 lb/in³
c Lattice Constant 3.42 Å3.42 ÅC/2
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 80.0 MPa11600 psi"ab" direction
Modulus of Elasticity 20.0 GPa2900 ksiYoung's modulus; "ab" direction
Compressive Yield Strength 100 MPa14500 psi"ab" direction
 
Thermal PropertiesMetricEnglishComments
CTE, linear  0.500 µm/m-°C
@Temperature 20.0 °C
0.278 µin/in-°F
@Temperature 68.0 °F
ab direction
 6.50 µm/m-°C
@Temperature 20.0 °C
3.61 µin/in-°F
@Temperature 68.0 °F
c direction
Thermal Conductivity >= 3.50 W/m-K>= 24.3 BTU-in/hr-ft²-°Fin "c" direction
 >= 400 W/m-K>= 2780 BTU-in/hr-ft²-°Fin "ab" direction
Sublimation Temperature 3650 °C6600 °F

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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Momentive Performance Materials Pyrolytic Graphite (PG) Coating

CADV76 / 452

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