49
Material
Temperature
（
°C
）
Emissivity
approximation
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
Emissivity table (cont.
)
