User Manual

8.5 Emissivity Values
Material
Condition
Temperature-
Range
Emissivity-
factor (ɛ)
Alu-
minium
polished
50°C … 100°C
0.04 ... 0.06
Raw surface
20°C … 50°C
0.06 ... 0.07
oxidized
50°C ... 500°C
0.2 ... 0.3
Aluminium oxide,
Aluminium powder
normal
Temperature
0.16
Brass
matt
20°C ... 350°C
0.22
oxidized at 600°C
200°C ... 600°C
0.59 ... 0.61
Polished
200°C
0.03
Wrought with
sandpaper
20°C
0.2
Bronze
polished
50°C
0.1
porous and raw
50°C ... 150°C
0.55
Chrome
polished
50°C
500°C ... 1000°C
0.1
0.28 ... 0.38
Copper
burnished
20°C
0.07
elektrolytic polished
80°C
0.018
elektrolytic
powdered
normal
Temperature
0.76
molten
1100°C ...
1300°C
0.13 ... 0.15
oxidized
50°C
0.6 ... 0.7
oxidized and black
5°C
0.88
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