English
C.A1886 – C.A1888
41
13. APPENDIX
13.1 TABLE OF EMISSIVITIES
Material
Temperature (°C)
Approximate emissivity
Metals
Aluminium
Polished aluminium
100
0.09
Commercial aluminium
sheet
100
0.09
Oxidized chrome-
anodised 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
