RayTek MARATHON MR - Page 55

Appendix
Marathon MR Rev. E2 04/2011 55
EMISSIVITY AT 1 µM FOR METALS
EMISSIVITY AT 1 µM FOR METALS
Material
Emissivity
Material
Emissivity
Aluminum
Iron, cast
unoxidized
0.1-0.2
oxidized
0.7-0.9
oxidized
0.4
unoxidized
0.35
roughened
0.2-0.8
molten
0.35
polished
0.1-0.2
Magnesium
0.3-0.8
Brass
Molybdenum
polished
0.1-0.3
oxidized
0.5-0.9
Burnished
0.6
unoxidized
0.25-0.35
Chromium
0.4
Monel (Ni-Cu)
0.3
Copper
Nickel
polished
0.05
oxidized
0.8-0.9
roughened
0.05-0.2
electrolytic
0.2-0.4
oxidized
0.2-0.8
Silver
0.04
Gold
0.3
Steel
Haynes
cold rolled
0.8-0.9
Alloy
0.5-0.9
polished sheet
0.35
Inconel
molten
0.35
oxidized
0.4-0.9
oxidized
0.8-0.9
sandblasted
0.3-0.4
stainless
0.35
electropolished
0.2-0.5
Tin (unoxidized)
0.25
Iron
Titanium
oxidized
0.4-0.8
polished
0.5-0.75
unoxidized
0.35
Zinc
molten
0.35
oxidized
0.6
polished
0.5
Table 11: Typical Emissivity Values (Metals)
EMISSIVITY AT 1 µM FOR NON-METALS
Material
Emissivity
Asbestos
0.9
Ceramic
0.4
Concrete
0.65
Carbon
unoxidized
0.8-0.95
Graphite
0.8-0.9
Table 12: Typical Emissivity Values (Non-Metals)