Use and Care Guide

61
Appendix III
Emissivity of Common Materials
Material
Temperature (°C

Emissivity
METALS
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
Stron
g
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
Iron
Polished cast iron
200
0.21
Processed cast iron
20
0.44
Polished tempered iron
40250
0.28
Polished steel ingot
7701040 0.520.56
Raw welded steel
9451100 0.520.61
Surface ferric oxide
20
0.69
Completely rusty surface
22
0.66
Rolled iron plate
100
0.74
Oxidized steel 198600 0.640.78
Cast iron (Oxidizing at 600°C)
198600
0.79
Steel (Oxidizing at 600°C )
125520 0.780.82
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