32
Material
Temperature
(
°C
)
Emissivity
approximation
Stainless steel
18-8
25
0.16
304(8Cr,18Ni)
215 ~ 490
0.44 ~ 0.36
310(25Cr,20Ni)
215 ~ 520
0.99 ~ 0.97
Tin
Commercial tin plate
100
0.07
Strong oxidization
0 ~ 200
0.60
Zinc
Oxidizing at 400°C
400
0.01
galvanized shining
iron plate
28
0.23
Ash zinc oxide
25
0.28
Non-metal materials
Brick
1100
0.75
Fire brick
1100
0.75
Graphite(lamp black)
96 ~ 225
0.95
Porcelain enamel
(white)
18
0.90
Asphaltum
0 ~ 200
0.85
Glass (surface)
23
0.94
Heat-resistance glass
200 ~ 540
0.85 ~ 0.95
Calcimine
20
0.90
Oak
20
0.90
Emissivity table (cont.)
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