Use and Care Guide

62
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
Meltin
g
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 polishin
g
25 0.05
Electroplate non-polishin
g
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
(
shinin
g)
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 allo
y
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
PDF compression, OCR, web optimization using a watermarked evaluation copy of CVISION PDFCompressor