User Manual
95
following tables. It must be remembered that these are only guideline figures. They can be
substantially increased if the surface is rough or even slightly oxidised.
The values quoted for oxidised metals assume that the metal is heavily oxidised. Thin oxide
layers will give an emissivity value between this and the value for an unoxidised surface.
If a more precise emissivity value is needed or more information is required on how to obtain
the emissivity value of a specific material, please contact: us.
Typical Emissivity Values
Refractories Miscellaneous
Alumina 0.40 Asphalt 0.90
Red Brick 0.93 Carbon >0.90
Graphite 0.85
Alloys Soot 0.95
Brass 0.10 Cement & Concrete 0.90
Oxidized 0.61 Cloth 0.85
Metals
Aluminium 0.05
Oxidized 0.30
Chromium 0.15
Cobalt 0.18
Gold 0.02
Iron & Steel 0.18
Oxidized 0.85
Lead 0.16
Oxidized 0.63
Magnesium 0.12
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