General Tools and Instruments GTi10-20-30-50 - Manual (Page 62)

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Emissivities of Common Materials (Con’t)
Material Temperature °C Emissivity
Electrolytic ferric oxide 500 1200 0.85 0.89
Iron plate 925 1120 0.87 0.95
Cast iron, heavy ferric oxide 25 0.80
Tempered iron, ferric oxide 40 250 0.95
Melting surface 22 0.94
Melting cast iron 1300 1400 0.29
Melting mild steel 1600 1800 0.28
Liquid steel 1500 1650 0.42 0.53
Pure liquid iron 1515 1680 0.42 0.45
Lead
Pure lead (Non-
oxidization)
125 225 0.06 0.08
Mildly oxidized 25 300 0.20 0.45
Magnesium
Magnesia 275 825 0.55 0.20
Magnesia 900 1670 0.20
Hg 0 100 0.09 0.12
Nickel
Electroplate polishing 25 0.05
Electroplate non-polishing 20 0.01
Nickel wire 185 1010 0.09 0.19
Nickel plate (oxidized) 198 600 0.37 0.48
Nickel oxide 650 1255 0.59 0.86
Nickel alloy
Nickel-chrome (heat-
resistance) alloy wire
(shining)
50 1000 0.65 0.79
Nickel-chrome alloy 50 1040 0.64 0.76
Nickel-chrome (heat
resistance)
50 500 0.95 0.98
Nickel-silver alloy 100 0.14
Silver
Polished silver 100 0.05
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