Total Emissivity of Surfaces at Quoted Temperatures
Material Temperature (oC) Total Emissivity
Iron
(i) Cast and polished 200 0.21
(ii) Rusted plate 19 0.69
(iii) Molten C.I. 1300 - 1400 0.29
Steel
(i) Polished 100 0.066
(ii) Sheet, oxidized 24 0.82
(iii) Plate, rough 38 -372 0.94 - 0.97
(iv) Molten 1522 - 1650 0.43 - 0.40
Aluminium
(i) Commercial sheet 100 0.09
(ii) Heavily oxidized 93 - 505 0.20 - 0.31
Copper; polished 100 0.052
Chromium; polished 100 0.075
Brass
(i) Polished 100 0.06
(ii) Rolled plate 22 0.06
Galvanized iron 28 0.23
Silver; polished 227 - 627 0.02 - 0.032
Tungestun filament 3320 0.39
Platinum filament 27 - 1230 0.036 - 0.192
Nichrome wire 49 - 1000 0.65 - 0.79
Aluminium paints 100 0.27 - 0.67
Oil paints 100 0.92 - 0.96
Glass 22 0.94
Asbestos board 23 0.96
Plaster; rough lime 10 - 87 0.91
Brick
(i) Red; rough 21 0.93
(ii) Building 1000 0.45
(iii) Fire clay 1000 0.75
(iv) Magnesite (refractory) 1000 0.38
Flat black lacquer 38 - 94 0.96 - 0.98
Water 0 - 100 0.95 - 0.96
Candle soot 97 - 272 0.952
Lamp-black 50 - 1000 0.96