Steel
sheet, rolled
50°C
0.56
rustless, rolled
700°C
0.45
rustless, sand-
blasted
700°C
0.70
Cast Iron
poured
50°C
1000°C
0.81
0.95
liquid
1300°C
0.28
at 600°C oxidized 200°C ... 600°C
0.64 ... 0.78
polished
200°C
0.21
Tin
burnish
20°C ... 50°C
0.04 ... 0.06
Titanium
at 540°C oxidized
200°C
500°C
1000°C
0.40
0.50
0.60
polished
200°C
500°C
1000°C
0.15
0.20
0.36
Wolfram
-
200°C
600°C ... 1000°C
0.05
0.1 ... 0.16
Heating wire
3300°C
0.39
Zinc
at 400°C oxidized 400°C
0.11
oxidized surface
1000°C ... 1200°C
0.50 ... 0.60
Polished
200°C ... 300°C
0.04 ... 0.05
sheet
50°C
0.20
Zirconium
Zirconium oxide,
Powder
normal temperature 0.16 ... 0.20
Zirconium
silicate, Powder
normal temperature 0.36 ... 0.42
Asbestos
tablet
20°C
0.96
Paper
40°C ... 400°C
0.93 ... 0.95
Powder
normal temperature 0.40 ... 0.60
slate
20°C
0.96
Coal
Heating wire
1000°C ... 1400°C
0.53
cleaned (0.9%
Asche)
100°C ... 600°C
0.81 ... 0.79
-38-
