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to Properties of carbon materials
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| Extruded graphite | ||||
| Chemical composition: carbon (C), ash 1500 ppm | ||||
| Property | Value in metric unit | Value in US unit | ||
| Density | 1.76*10³ | kg/m³ | 110 | lb/ft³ |
|---|---|---|---|---|
| Maximum grain size | 760 | μm | 30 | microinch |
| Permeability | 2*10-2 | Darcy | 2*10-2 | Darcy |
| Modulus of elasticity WG | 10 | GPa | 1450 | ksi |
| Modulus of elasticity AG | 8.5 | GPa | 1230 | ksi |
| Flexural strength WG | 20 | MPa | 2900 | psi |
| Flexural strength AG | 19 | MPa | 2755 | psi |
| Tensile strength WG | 14 | MPa | 2030 | psi |
| Tensile strength AG | 12 | MPa | 1740 | psi |
| Compressive strength | 55 | MPa | 8000 | psi |
| Hardness (Rockwell R) | 93 | RR | 93 | RR |
| Thermal expansion WG | 3.2*10-6 | ºCˉ¹ | 1.8*10-6 | in/(in*ºF) |
| Thermal expansion AG | 3.8*10-6 | ºCˉ¹ | 2.1*10-6 | in/(in*ºF) |
| Thermal conductivity WG | 156 | W/(m*K) | 1081 | BTU*in/(hr*ft²*ºF) |
| Thermal conductivity AG | 140 | W/(m*K) | 970 | BTU*in/(hr*ft²*ºF) |
| Electric resistivity WG | 2.9*10-6 | Ohm*m | 2.9*10-4 | Ohm*cm |
| Electric resistivity AG | 3.4*10-6 | Ohm*m | 3.4*10-4 | Ohm*cm |
WG - with grain direction
AG - against grain direction
Applications: quartz processing, casting molds, silicon crystal growth, furnace parts.