63
Emissivities of Common Materials (Con’t)
Material
Temperature
°C
Emissivity
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
Carbon piece
0.85
Isolation piece
0.91
0.94
Sheet metal
0.88
0.90
Glass pipe
0.90
Loop type
0.87
Porcelain enamel
products
0.90
Porcelain enamel
designs
0.83
0.95
Solid materials
0.80
0.93
Ceramics (vase type)
0.90
Film
0.90
0.93
Mica
0.94
0.95
Flume mica
0.90
0.93
Glass
0.91
0.92
Semiconductor
0.80
0.90
Transistor (plastics sealed)
0.30
0.40
Transistor (metal)
Diode
0.89
0.90
Transmitting loop
Pulse transmission
0.91
0.92
Level chalkiness layer
0.88
0.93
Top loop
0.91
0.92
