6
Table of Surface Emissivity
Measure Surface
Switch Setting
METALS
Aluminum
Oxidized
0.2 – 0.4
Alloy A3003
Oxidized
0.3
Roughened
0.1 – 0.3
Brass
Burnished
0.3
Oxidized
0.5
Cooper
Oxidized
0.4 – 0.8
Electrical Terminal Blocks
0.6
Haynes
Alloy
0.3 – 0.8
Inconel
Oxidized
0.7 – 0.95
Sandblasted
0.3 – 0.6
Electoropolished
0.15
Iron
Oxidized
0.5 – 0.9
Rusted
0.5 – 0.7
Iron Cast
Oxidized
0.6 – 0.95
Unoxidized
0.2
Molten
0.2 – 0.3
Iron Wrought
Dull
0.9
Lead
Rough
0.4
Oxidized
0.2 – 0.6
Molydbenum
Oxidized
0.2 – 0.6
Nickel
Oxidized
0.2 – 0.5
Platinum
Black
0.9
Steel
Cold-Rolled
0.7 – 0.9
Ground Sheet
0.4 – 0.6
Polished Sheet
0.1
Zinc
Oxidized
0.1
Measure Surface
Switch Setting
NON-METALS
Asbestos
0.95
Asphalt
0.95
Basalt
0.7
Carbon
Unoxidized
0.8 – 0.9
Graphite
0.7 – 0.8
Carborundum
0.9
Ceramic
0.95
Clay
0.95
Concrete
0.95
Cloth
0.95
Glass
Plate
0.85
Gravel
0.95
Gypsum
0.8 – 0.95
Ice
0.98
Limestone
0.98
Paper (any colour)
0.95
Plastic
Opaque
0.95
Soil
0.9 – 0.98
Water
0.93
Wood, (natural)
0.9 – 0.95