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A1.2 Metals - Typical Emissivity Values
1.0 µm 1.6 µm 5.1 µm 8-14 µm
Aluminum
Non-Oxidized 0.1-0.2 0.02-0.2 0.02-0.2 0.02-0.1
Oxidized 0.4 0.4 0.2-0.4 0.2-0.4
Alloy A 3003
Oxidized — 0.4 0.4 0.3
Roughened 0.2-0.8 0.2-0.6 0.1-0.4 0.1-0.3
Polished 0.1-0.2 0.02-0.1 0.02-0.1 0.02-0.1
Brass
Polished 0.8-0.95 0.01-0.05 0.01-0.05 0.01-0.05
Burnished — — 0.3 0.3
Oxidized 0.6 0.6 0.5 0.5
Carbon
Non-oxidized 0.8-0.95 0.8-0.9 0.8-0.9 0.8-0.9
Graphite 0.8-0.9 0.8-0.9 0.7-0.9 0.7-0.8
Chromium 0.4 0.4 0.03-0.3 0.02-0.2
Copper
Polished 0.05 0.03 0.03 0-03
Roughened 0.05-0.2 0.05-0.2 0.05-0.15 0.05-0.1
Oxidized 0.2-0.8 0.2-0.9 0.5-0.8 0.4-0.8
Gold 0.3 0.01-0.1 0.01-0.1 0.01-0.1
Haynes Alloy 0.5-0.9 0.6-0.9 0.3-0.8 0.3-0.8
Inconel
Oxidized 0.4-0.9 0.6-0.9 0.6-0.9 0.7-0.95
Sandblasted 0.3-0.4 0.3-0.6 0.3-0.6 0.3-0.6
Electro-polished 0.2-0.5 0.25 0.15 0.15
Iron
Oxidized 0.4-0.8 0.5-0.9 0.6-0.9 0.5-0.9
Non-oxidized 0.35 0.1-0.3 0.05-0.25 0.05-0.2
Rusted — 0.6-0.9 0.5-0.8 0.5-0.7
Molten 0.35 0.4-0.6 — —
Iron Cast
Oxidized 0.7-0.9 0.7-0.9 0.65-0.95 0.6-0.95
Non-oxidized 0.35 0.3 0.25 0.2
Molten 0.35 0.3-0.4 0.2-0.3 0.2-0.3
Iron Wrought
Dull 0.9 0.9 0.9 0.9
Lead
Polished 0.35 0.05-0.2 0.05-0.2 0.05-0.1
Rough 0 65 0.6 0.4 0-4
Oxidized — 0.3-0.7 0.2-0.6 0.2-0.6
Magnesium 0.3-0.8 0.05-0.3 0.03-0.15 0.02-0.1
Mercury — 0.05-0.15 0.05-0.15 0.05-0.15
Molybdenum
Oxidized 0.5-0.9 0.4-0.9 0.3-0.7 0.2-0.6
Non-oxidized 0.25-0.35 0.1-0.3 0.1-0.15 0.1
Monel (Ni-Cu) 0.3 0.2-0.6 0.1-0.5 0.1-0.14
Nickel
Oxidized 0.8-0.9 0.4-0.7 0.3-0.6 0.2-0.5
Electrolytic 0.2-0.4 0.1-0.3 0.1-0.15 0.05-0.15
Platinum
Black — 0.95 0.9 0.9
Silver 0.04 0.02 0.02 0.02
Steel
Cold-Rolled 0.8-0.9 0.8-0.9 0.8-0.9 0.7-0.9
Ground Sheet — — 0.5-0.7 0.4-0.6
Polished Sheet 0.35 0.25 0.15 0.1
Molten 0.35 0.25-0.4 0.1-0.2 —
Oxidized 0.8-0.9 0.8-0.9 0.7-0.9 0.7-0.9
Stainless 0.35 0.2-0.9 0.15-0.8 0.1-0.8
Tin (Non-oxidized) 0.25 0.1-0.3 0.05 0.05
Titanium
Polished 0.5-0.75 0.3-0.5 0.1-0.3 0.05-0.2
Oxidized — 0.6-0.8 0.5-0.7 0.5-0.6