Emissivity of Common Materials
☞
Important
Emissivity tables only provide approximate values. Actual emissivity values
will always vary depending on the measuring conditions, and should be
calculated using other methods.
Table G‑1. Emissivities for spectral range: 0.7 μm to 1.1 μm
Target Object Material
Emissivity (%)
Aluminum, bright
15
Blackbody furnace
100
Brass, oxidized (tarnished)
65 to 75
Brick
85 to 90
Bronze, bright
3
Chamotte
45 to 60
Chromium, bright
28 to 32
Copper, oxidized
88
Earthenware, glazed
86 to 90
Gold, bright
2
Graphite
80 to 92
Nickel
22
Porcelain, glazed
60
Porcelain, rough
80 to 90
Silver, bright
2
Slag
85
Soot
95
Steel, heavily scaled
93
Steel, molten
30
Steel, rolling skin
88
Zinc
58
Table G‑2. Emissivities for spectral range: 1.45 μm to 1.8 μm
Target Object Material
Emissivity (%)
Aluminum, bright
10
Impac
®
Series 600 Pyrometer
Appendix
G
57010228-00C
Emissivity of Common Materials
G‑1