Dwyer TIC - Manual (Page 77)

76
Appendix
Emissivity table (continue)
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 0.90～0.97
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