E-11
Steel plate (oxidized) 0.9
Iron plate (rusted) 0.7 to 0.85
Cast iron (rough) rusted 0.95
Rough ingot iron 0.9
EMISSIVITY VALUES
Typical Emissivity Values; Metals
SURFACE EMISSIVITY
Molten cast iron 0.3
Molten mild steel 0.3 to 0.4
Stainless steel (polished) 0.1
Stainless steel (various) 0.2 to 0.6
Aluminum
Polished aluminum 0.1*
Aluminum (heavily oxidized) 0.25
Aluminum oxide at 260°C 0.6
Aluminum oxide at 800°C 0.3
Aluminum Alloys various 0.1 to 0.25
Brass
Brass (polished) 0.1*
Brass (roughened surface) 0.2
Brass (oxidized) 0.6
Copper
Copper (polished) 0.05*
Copper plate (oxidized) 0.8
Molten copper 0.15
Lead
Lead (pure) 0.1*
Lead (oxidized at 25°C) 0.3
Lead (oxidized , reated to 200°C) 0.6
Nickel and its alloys
Nickel (pure) 0.1*
Nickel plate (oxidized) 0.4 to 0.5
Nichrome 0.7
Nichrome (oxidized) 0.95
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