Aluminum - Radiation Heat Emissivity
Radiation heat emissivity of unoxidized, oxidized and polished aluminum
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The emissivity coefficient - ε - indicates the radiation of heat from a body according the Stefan-Boltzmann Law, compared with the radiation of heat from a ideal black body where the emissivity coefficient ε = 1.
The emissivity coefficient - ε - for some common qualities of aluminum:
| Aluminum | Temperature oF (oC) | Emissivity Coefficient - ε - |
|---|---|---|
| Unoxidized | 77 (25) | 0.02 |
| Unoxidized | 212 (100) | 0.03 |
| Unoxidized | 932 (500) | 0.06 |
| Oxidized | 390 (199) | 0.11 |
| Oxidized | 1110 (599) | 0.19 |
| Oxidized at 1110oF (599oC) | 390 (199) | 0.11 |
| Oxidized at 1110oF (599oC) | 1110 (599) | 0.19 |
| Heavily Oxidized | 200 (93) | 0.20 |
| Heavily Oxidized | 940 (504) | 0.31 |
| Highly Polished | 212 (100) | 0.09 |
| Roughly Polished | 212 (100) | 0.18 |
| Commercial Sheet | 212 (100) | 0.09 |
| Highly Polished Plate | 440 (227) | 0.04 |
| Highly Polished Plate | 1070 (577) | 0.06 |
| Bright Rolled Plate | 338 (170) | 0.04 |
| Bright Rolled Plate | 932 (500) | 0.05 |
| Alloy A3003, Oxidized | 600 (316) | 0.40 |
| Alloy A3003, Oxidized | 900 (482) | 0.40 |
| Alloy 1100-0 | 200-800 (93-427) | 0.05 |
| Alloy 24ST | 75 (24) | 0.09 |
| Alloy 24ST, Polished | 75 (24) | 0.09 |
| Alloy 75ST | 75 (24) | 0.11 |
| Alloy 75ST, Polished | 75 (24) | 0.08 |
The relatively low emissivity coefficient makes aluminum a suitable product for limiting the radiated heat from a body. Its by example common to use aluminum coating in rescue and survival equipment for outdoor operations.
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