Emissivity Table
6
Material
METALS
Emissivity (ε)
Aluminum – pure highly polished plate . . . . . .. . . . . . . . . . . . . . . . 0.04 to 0.06
Aluminum – heavily oxidized . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.20 to 0.31
Aluminum – commercial sheet . . . . . . . . . . . . .. . . . . . . . . . . . . . .. . . . . . . . 0.09
Brass – dull plate . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . .. . . . . . . . 0.22
Brass – highly polished, 73.2% Cu, 26.7% Zn . ... . . . . . . . . . . . . . . . . . . . . 0.03
Chromium – polished . . . . . . . . . . . . . . . . . . . .. . . . . . .. . . . . . . . . . 0.08 to 0.36
Copper – polished . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. . . . . . . . . . . . . 0.05
Copper – heated at 600°C (1112°F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.57
Gold – pure, highly polished or liquid . . . . . . . . . . . . . . . . .. . . . . . 0.02 to 0.04
Iron and steel (excluding stainless) – polished iron ... . . . .. . . . . . 0.14 to 0.38
Iron and steel (excluding stainless) – polished cast iron . . . . . .. . . . . . . . . 0.21
Iron and steel (excluding stainless) – polished wrought iron ... . . . .. . . . . . 0.2
Iron and steel (excluding stainless) – oxidized dull wrought iron . . . . . . . 0.94
Iron and steel (excluding stainless) – rusted iron plate . . . . . . . . . . . . . . . 0.69
Iron and steel (excluding stainless) – polished steel . . . . . . . . . . . . . . . . . . 0.07
Iron and steel (excluding stainless) – polished steel oxidized at
600°C (1112°F) . . . . . . . . . . . . . . . . . . . . . . 0.79
Iron and steel (excluding stainless) – rolled sheet steel . . . . . . . . . . . . . . 0.66
Iron and steel (excluding stainless) – rough steel plate . . . . . . . . . 0.94 to 0.97
Lead – gray and oxidized . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 0.28
Mercury . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.09 to 0.12
Molybdenum filament . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.10 to 0.20
Nickel – polished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.07
Nickel – oxidized at 649 to 1254°C (1200 to 2290°F) . . . . . . . . . . 0.59 to 0.86
Platinum – pure polished plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05 to 0.10
Platinum – wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.07 to 0.18
Silver – pure and polished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02 to 0.03
Stainless steel – polished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.07
Stainless steel – Type 301 at 232 to 941°C (450 to 1725°F) . . . . . . . 0.54 to 0.63
Tin – bright . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.06
Tungsten – filament . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.39
Zinc – polished commercial pure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 0.05
Zinc – galvanized sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.23
11
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