General Tools and Instruments GTi10-20-30-50 - Manual (Page 63)

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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