Dwyer TIC - Manual (Page 76)

75
Appendix
Emissivity table (continue)
Material Temperature（°C）
Emissivity
approximation
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 20 0.01
non-polishing
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