81
Appendix
Emissivity table (continue)
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
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