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Appendices
Typical Emissivity Values C
C-3
Table C-1. Emissivity Values for Metals (cont)
Emissivity
Material
1.0 µm 1.6 µm 8 to14 µm
Iron, Cast
Oxidized 0.7-0.9 0.7-0.9 0.6-0.95
Unoxidized 0.35 0.3 0.2
Molten 0.35 0.3-0.4 0.2-0.3
Iron, Wrought
Dull 0.9 0.9 0.9
Lead
Polished 0.35 0.05-0.2 n.r.
Rough 0.65 0.6 0.4
Oxidized n.r. 0.3-0.7 0.2-0.6
Magnesium 0.3-0.8 0.05-0.3 n.r.
Mercury n.r. 0.05-0.15 n.r.
Molybdenum
Oxidized 0.5-0.9 0.4-0.9 0.2-0.6
Unoxidized 0.25-0.35 0.1-0.35 0.1
Monel (Ni-Cu) 0.3 0.2-0.6 0.1-0.14
Nickel
Oxidized 0.8-0.9 0.4-0.7 0.2-0.5
Electrolytic 0.2-0.4 0.1-0.3 n.r.
Platinum
Black n.r. 0.95 0.9
Silver n.r. 0.02 n.r.
Steel
Cold-Rolled 0.8-0.9 0.8-0.9 0.7-0.9
Ground Sheet n.r. n.r. 0.4-0.6
Polished Sheet 0.35 0.25 0.1
Molten 0.35 0.25-0.4 n.r.
Oxidized 0.8-0.9 0.8-0.9 0.7-0.9
Stainless 0.35 0.2-0.9 0.1-0.8