11. EMISSIVITY TABLE
Material
Iron
Polished cast iron
Processed cast iron 20
Polished tempered
iron
Polished steel ingot
Raw welded steel
Surface ferric oxide
Completely rusty
surface
Rolled iron plate
Oxidized steel
Cast iron
(Oxidizing at 600°C)
Steel
(Oxidizing at 600°C )
Electrolytic ferric
oxide
Iron plate
Cast iron,
heavy ferric oxide
Tempered iron,
ferric oxide
Melting surface
Melting cast iron
Melting mild steel
Liquid steel
Pure lead
Silver
Polished Silver
Temperature
Emissivity
(°C)
approximation
200
0,21
0,44
40 ~ 250
0,28
770 ~ 1040 0,52 ~ 0,56
945 ~ 1100 0,52 ~ 0,61
20
0,69
22
0,66
100
0,74
198 ~ 600
0,64 ~ 0,78
198 ~ 600
0,79
125 ~ 520
0,78 ~ 0,82
500 ~ 1200 0,85 ~ 0,89
925 ~ 1120 0,87 ~ 0,95
25
0,80
40 ~ 250
0,95
22
0,94
1300 ~ 1400 0,29
1600 ~ 1800 0,28
1500 ~ 1650 0,42 ~ 0,53
1515 ~ 1680 0,42 ~ 0,45
100
0,05
Operating manual – Infrared camera
Material
Nickel
Nickel-chrome
(heat-resistance)
Nickel-chrome alloy
Nickel-chrome alloy
(heat resistance)
Nickel-silver alloy
Lead
Pure lead
(Non-oxidization)
Stainless steel
18 - 8
304 (8Cr, 18Ni)
310 (25Cr, 20Ni)
Tin
Commercial tin plate 100
Strong oxidization
Zinc
Oxidizing at 400°C
galvanized shining
iron plate
Ash zinc oxide
Magnesium
Magnesia
Hg
Nickel
Electroplate polishing 25
Electroplate
Nickel wire
Nickel alloy (oxide)
Temperature
Emissivity
(°C)
approximation
50 ~ 1000
0,65 ~ 0,79
50 ~ 1040
0,64 ~ 0,76
50 ~ 500
0,95 ~ 0,98
100
0,14
125 ~ 225
0,06 ~ 0,08
25
0,16
215 ~ 490
0,44 ~ 0,36
215 ~ 520
0,90 ~ 0,97
0,07
0 ~ 200
0,60
400
0,01
28
0,23
25
0,28
275 ~ 825
0,55 ~ 0,20
0 ~ 100
0,09 ~ 0,12
0,05
20
0,01
185 ~ 1010
0,09 ~ 0,19
198 ~ 600
0,37 ~ 0,48
B - 22