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C-2
Table C-1. Emissivity Values for Metals
Emissivity
Material
1.0 µm 1.6 µm 8 to 14 µm
Aluminum
Unoxidized 0.1-0.2 0.02-0.2 n.r.
Oxidized 0.4 0.4 0.2-0.4
Alloy A3003,
Oxidized n.r. 0.4 0.3
Roughened 0.2-0.8 0.2-0.6 0.1-0.3
Polished 0.1-0.2 0.02-0.1 n.r.
Brass
Polished 0.8-0.95 0.01-0.05 n.r.
Burnished n.r. n.r. 0.3
Oxidized 0.6 0.6 0.5
Chromium 0.4 0.4 n.r.
Copper
Polished n.r. 0.03 n.r.
Roughened n.r. 0.05-0.2 n.r
Oxidized 0.2-0.8 .2-0.9 0.4-0.8
Electrical Terminal Blocks n.r. n.r. 0.6
Gold 0.3 0.01-0.1 n.r.
Haynes Alloy 0.5-0.9 0.6-0.9 0.3-0.8
Inconel
Oxidized 0.4-0.9 0.6-0.9 0.7-0.95
Sandblasted 0.3-0.4 0.3-0.6 0.3-0.6
Electropolished 0.2-0.5 0.25 0.15
Iron
Oxidized 0.4-0.8 0.5-0.9 0.5-0.9
Unoxidized 0.35 0.1-0.3 n.r.
Rusted n.r. 0.6-0.9 0.5-0.7
Molten 0.35 0.4-0.6 n.r.