45
Material
Temperature
(
°C
)
Emissivity
approximation
Metal
Aluminum
Polished aluminum
100
0.09
Commercial aluminum
foil
100
0.09
Electrolytic
chromeplate alumina
25
~
600
0.55
Mild alumina
25 ~ 600
0.10 ~ 0.20
Strong alumina
25 ~ 600
0.30 ~ 0.40
Brass
Brass mirror (highly
polished)
28
0.03
Brass oxide
200 ~ 600
0.61 ~ 0.59
Chrome
Polished chrome
40 ~ 1090
0.08 ~ 0.36
Copper
Copper mirror
100
0.05
Strong copper oxide
25
0.078
Cuprous oxide
800 ~ 1100
0.66 ~ 0.54
Liquid copper
1080 ~ 1280
0.16 ~ 0.13
Gold
Gold mirror
230 ~ 630
0.02
Emissivity table