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Emissivity Table
6
11
Material 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 . . . . . . . . . . . . . . . 0.28
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
METALS