55
Appe n dix A
Com m on m a t e r ia l e m issiv it y
（
FYI
）
M a t e r ia l
Sur fa ce
Te m pe r a t ur e ° C
Em issivit y
（
ε
）
Alum inum
Non- oxidized
100
0.20
Oxidized
100
0.55
Brass
Burnished t o Brow n
20
0.40
Dull lust er
38
0.22
Oxidized
100
0.61
Copper
Seriously Oxidized
20
0.78
I ron
Oxidized
100
0.74
Rust y
25
0.65
Cast iron
Oxidized
200
0.64
Non- Oxidized
100
0.21
Wrought iron
Quarry- faced
25
0.94
Polished
38
0.28
Nickel
Oxidized
200
0.37
St ainless st eel
Oxidized
60
0.85
St eel
Oxidized
200
0.79
Com m on brick
Surface
20
0.93
Concret e
Surface
20
0.92
Glass
Polished plat e
20
0.94
Lacquer
Whit e
100
0.92
Black
100
0.97
Carbon
Sm oke black
25
0.95
Candle soot
20
0.95
Rough lead surface
20
0.98
Oil paint
Value of 16 colors
100
0.94
Paper
Whit e
20
0.93
Sand soil
Surface
20
0.90
Tim ber
Dressed
20
0.90
Wat er
Dist illed wat er
20
0.96
Skin
Hum an
32
0.98
Ceram ic
Thin
21
0.90
Thick
21
0.93
