Pyrolytic Graphite Planchet 25.4 x 1.6

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

SKU: 76290-16
Pack: Each