English
34
C.A 1877 – C.A 1878
12. APPENDIX
12.1 TABLE OF EMISSIVITIES
Material
Temperature (°C)
Approximate emissivity
Metals
Aluminium
Polished aluminium
100
0.09
Commercial aluminium
sheet
100
0.09
Oxidized chrome-
anodized aluminium
25
~
600
0.55
Slightly oxidized
aluminium
25
~
600
0.10
~
0.20
Highly oxidized
aluminium
25
~
600
0.30
~
0.40
Brass
Shiny brass (extreme
polishing)
28
0.03
Oxidized brass
200
~
600
0.61
~
0.59
Chromium
Polished chromium
40
~
1090
0.08
~
0.36
Copper
Shiny copper
100
0.05
Highly oxidized copper
25
0.078
Copper oxide
800
~
1100
0.66
~
0.54
Molten copper
1080
~
1280
0.16
~
0.13
Gold
Shiny gold
230
~
630
0.02
Lead
Pure lead (no oxidation)
125
~
225
0.06
~
0.08
Slightly oxidized
25
~
300
0.20
~
0.45
Magnesium
Magnesia
275
~
825
0.55
~
0.20
Magnesia
900
~
1670
0.20
Mercury
0
~
100
0.09
~
0.12
Nickel
Polished by anodizing
25
0.05
Electrolysed
20
0.01
Unpolished