Appendix
Typical Emissivity Values
143
15
Metals
Emissivity
Material
1 µm
1.6 µm
2.4 µm
Silver
0.02
0.02
Steel
Cold-Rolled
0.8-0.9
0.8-0.9
Ground Sheet
0.6-0.7
Polished Sheet
0.35
0.25
0.2
Molten
0.35
0.25-0.4
0.25-0.4
Oxidized
0.8-0.9
0.8-0.9
0.8-0.9
Stainless
0.35
0.2-0.9
0.2-0.9
Tin (Unoxidized)
0.25
0.1-0.3
0.1-0.3
Titanium
Polished
0.5-0.75
0.3-0.5
0.2-0.5
Oxidized
0.6-0.8
0.6-0.8
Tungsten
0.1-0.6
Polished
0.35-0.4
0.1-0.3
0.1-0.3
Zinc
Oxidized
0.6
0.15
0.15
Polished
0.5
0.05
0.05
