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Material
Condition
Temperature-
Range
Emissivity-
factor (ɛ)
Vulcanite
-
normal
temperature
0.89
Grease
coarse
80°C
0.85
Silicon
Granulate powder
normal
temperature
0.48
Silicon, Powder
normal
temperature
0.30
Slag
furnace
0°C ... 100°C
200°C ... 1200°C
0.97 ... 0.93
0.89 ... 0.70
Snow
-
-
0.80
Stucco
rough, burned
10°C ... 90°C
0.91
Bitumen
Waterproof paper
20°C
0.91 ... 0.93
Water
Layer on metal
surface
0°C ... 100°C
0.95 ... 0.98
Brick
Chamotte
20°C
1000°C
1200°C
0.85
0.75
0.59
Fire-resistant
1000°C
0.46
Fire-resistant, high-
blasted
500°C ... 1000°C
0.80 ... 0.90
Fire-resistant, low-
blasted
500°C ... 1000°C
0.65 ... 0.75
Silicon (95% Si0²)
1230°C
0.66
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