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
Iron
With red rust
20°C
0.61 ... 0.85
elektrolytic
polished
175°C ... 225°C
0.05 ... 0.06
Wrought with
sandpaper
20°C
0.24
oxidized
100°C
125°C ... 525°C
0.74
0.78 ... 0.82
Hot-rolled
20°C
0.77
Hot-rolled
130°C
0.6
Laquer
Bakelite
80°C
0.93
black, matt
40°C ... 100°C
0.96 ... 0.98
black, high-
glossed,
sprayed onto
iron
20°C
0.87
Heat-
resistant
100°C
0.92
white
40°C ... 100°C
0.80 ... 0.95
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