INST.No.INE-378-P9CE
- 44 -
8.1.2 Emissivity table (
= 0.9µm)
Metal
Emissivity
Aluminum
0.10 to 0.23
Gold
0.015 to 0.02
Chrome
0.36
Cobalt
0.28 to 0.30
Iron
0.33 to 0.36
Copper
0.03 to 0.06
Tungsten
0.38 to 0.42
Titanium
0.50 to 0.62
Nickel
0.26 to 0.35
Platinum
0.25 to 0.30
Molybdenum
0.28to 0.36
Alloy
Emissivity
Inconel X
0.40 to 0.60
Inconel 600
0.28
Inconel 617
0.29
Inconel
0.85 to 0.93
Incoloy 800
0.29
Kanthal
0.80 to 0.90
Stainless steel
0.30
Hastelloy X
0.3
Semi conductor
Emissivity
Silicon
0.69 to 0.71
Germanium
0.60
Gallium arsenic
0.68
Ceramics
Emissivity
Silicon carbide
0.80 to 0.83
Titanium carbide
0.47 to 0.50
Silicon nitride
0.89 to 0.90
Other
Emissivity
Carbon pigment
0.90 to 0.95
Graphite
0.87 to 0.92
The above tables are not applied to two colors thermometers.
Reference
Caution
The emissivity value varies by surface temperature, measured temperature and other
conditions.
Use the above tables as guidance.
Metal
Emissivity
Aluminum
0.09 to 0.40
Chrome
0.34 to 0.80
Cobalt
0.28 to 0.65
Copper
0.05 to 0.80
Gold
0.02
Steel plate
0.30 to 0.85
Lead
0.28 to 0.65
Magnesium
0.24 to 0.75
Molybdenum
0.25 to 0.80
Nickel
0.25 to 0.85
Palladium
0.23
Platinum
0.22
Rhodium
0.18
Silver
0.04 to 0.10
Tantalum
0.20 to 0.80
Tin
0.28 to 0.60
Titanium
0.50 to 0.80
Tungsten
0.30
Zinc
0.32 to 0.55
Alloy
Emissivity
Brass
0.18 to 0.70
Chromel, Alumel
0.30 to 0.80
Constantan, Manganin
0.22 to 0.60
Inconel
0.30 to 0.85
Monel
0.22 to 0.70
Nickel Chrome
0.28 to 0.85
Ceramics
Emissivity
Alumina ceramics
0.30
Red brick
0.80
White brick
0.35
Silicon brick
0.60
Sillimanite brick
0.60
Ceramics
0.50
Other
Emissivity
Asbestos
0.90
Asphalt
0.85
Carbon
0.85
Graphite
0.80
Soot
0.95
Cement, Concrete
0.70
Cloth
0.80
8.1.3 Emissivity table (
= 1.55µm)