Related Resources: heat transfer
Emittance of Commonly Used Materials
Emittance Data of Commonly Used Materials
See also: Emissivity of Surface Table
Thermal emittance refers to the ability of a material to radiate the heat that it absorbs. It is described through a number varying between 0 and 1, representing the comparative/relative emittance with respect to a blackbody operating in similar conditions.
| Material | Emittance ε at ~80°F |
| All-service jacket (ASJ) |
0.9 |
| Aluminum paint |
0.5 |
| Aluminum | |
| Anodized |
0.8 |
| Commercial sheet |
0.1 |
| Embossed |
0.2 |
| Oxidized |
0.1 to 0.2 |
| Polished |
0.04 |
| Aluminum-zinc coated steel |
0.06 |
| Canvas |
0.7 to 0.9 |
| Colored mastic |
0.9 |
| Copper | |
| Highly polished |
0.03 |
| Oxidized |
0.8 |
| Elastomeric or polyisobutylene |
0.9 |
| Galvanized steel |
|
| Dipped or dull |
0.3 |
| New, bright |
0.1 |
| Iron or steel |
0.8 |
| Painted metal |
0.8 |
| Plastic pipe or jacket (PVC, PVDC, or PET) |
0.9 |
| Roofing felt and black mastic |
0.9 |
| Rubber |
0.9 |
| Silicon-impregnated fiberglass fabric |
0.9 |
| Stainless steel | |
| New, cleaned |
0.2 |
| Oxidized in service | 0.32 |
Related
- Black Body Radiation Formula and Calculator- Heat Transfer
- Infrared (IR) or Radiant Heating Review
- Extruded Finned Heat Sink Radiation Formulae
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