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Carbon and Graphite Felt
The carbon and graphite felts are processed from a rayon precursor and fired to graphitizing temperatures. Primarily used as high temperature insulation in inert or vacuum atmospheres offering high stability through rapid thermal cycling.
Distinctive Characteristics
- Superior thermal properties over a wide range of operating temperatures
- High stability with low shrinkage
- Flexible and easy to handle
- Low density and thermal mass
- Greater efficiency in heating and cooling
- Low thermal conductivity
- Uniformity through the material
- Available in different lengths, widths and thicknesses
- Easily cut to fit specific size requirements
- Can be halogen purified to reduce impurity levels into the ppm range
| Property | Units | Determined at Degrees C | |
|---|---|---|---|
| Density | Lb/cu ft | 20 | 5.0-5.5 |
| Tensile Strength, Min. | Lb/in-width | 20 | 1-2 |
| Comprehensive Strength, 10% deformation | Lb/sq. in | 20 | 0.2-1.0 |
| Shrinkage, Linear | % | to 3000 | 0-1 |
| Water Absorption, in 90% relative humidity | Weight % | 20 | 0-1 |
| Carbon Assay, Min | % | 99-99.9 | |
| Ash | % | .02-.25 | |
| Specific Heat | BTU/lb?deg F | 20 | 0.17 |
| Specific Heat, Mean | BTU/lb/deg F | 1400 | 0.4 |
| Emissivity | 0.99 | ||
| Sublimation Temp | Deg C | 3600 | |
| Surface Area (Via Nitrogen) | Sq. m/g | 20 | 0.6-0.7 |
| Thermal Conductivity | BTU in/hr/sq ft/deg F | 1000 1400 |
1.75 2.98 |
| Vapor Pressure, App. | Microns | 2270 2440 2620 |
1 10 100 |
| Nominal Thickness | Nominal Width | Nominal Length |
|---|
| Size | Inches | mm | Inches | mm | Min. Yard | Typ. Yard |
| 1/8 | 0.110 | 2.8 | 44 | 1,118 | 16 | 52 |
| 5 mm | 0.200 | 5.1 | 44 | 1,118 | 16 | 34 |
| 49 | 1,245 | 16 | 34 | |||
| 1/4 | 0.220 | 5.6 | 44 | 1,118 | 16 | 34 |
| 49 | 1,245 | 16 | 34 | |||
| 10 mm | 0.394 | 10 | 44 | 1,118 | 8 | 17 |
| 49 | 1,245 | 8 | 17 | |||
| 1/2 | 0.440 | 11.2 | 44 | 1,118 | 8 | 17 |
| 49 | 1,245 | 8 | 17 | |||
| 1 | 0.880 | 22.4 | 44 | 1,118 | 4 | 8 |