Aluminum - Radiation Heat Emissivity

Radiation heat emissivity of unoxidized, oxidized and polished aluminum

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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