Grading Guide
Temp F˚ (C˚)
Emissivity
Alloys
20-Ni, 24-CR, 55-FE, Oxid.
392 (200) 0.9
20-Ni, 24-CR, 55-FE, Oxid.
932 (500) 0.97
60-Ni, 12-CR, 28-FE, Oxid.
518 (270) 0.89
60-Ni, 12-CR, 28-FE, Oxid.
1040 (560) 0.82
80-Ni, 20-CR, Oxidised 212 (100) 0.87
80-Ni, 20-CR, Oxidised 1112 (600) 0.87
80-Ni, 20-CR, Oxidised 2372 (1300) 0.89
Aluminium
Unoxidised 77 (25) 0.02
Unoxidised 212 (100) 0.03
Unoxidised 932 (500) 0.06
Oxidised 390 (199) 0.11
Oxidised 1110 (599) 0.19
Oxidised at 1110
˚
F (599
˚
C)
390 (199) 0.11
Oxidised at 1110
˚
F (599
˚
C)
1110 (599) 0.19
Heavily Oxidised 200 (93) 0.2
Heavily Oxidised 940 (504) 0.31
Highly Polished 212 (100) 0.09
Roughly Polished 212 (100) 0.18
Commercial Sheet 212 (100) 0.09
Highly Polished Plate 440 (227) 0.04
Highly Polished Plate 1070 (577) 0.06
Bright Rolled Plate 338 (170) 0.04
Bright Rolled Plate 932 (500) 0.05
Alloy A3003, Oxidised 600 (316) 0.4
Alloy A3003, Oxidised 900 (482) 0.4
Alloy 1100-0 200-800
(93-427)
0.05
Alloy 24ST 75 (24) 0.09
Alloy 24ST, Polished 75 (24) 0.09
Alloy 75ST 75 (24) 0.11
Alloy 75ST, Polished 75 (24) 0.08
Bismuth, Bright
176 (80) 0.34
Bismuth, Unoxidised
77 (25) 0.05
212 (100) 0.06
Brass
73% Cu, 27% Zn, Polished
476 (247) 0.03
73% Cu, 27% Zn, Polished
674 (357) 0.03
62% Cu, 37% Zn, Polished
494 (257) 0.03
62% Cu, 37% Zn, Polished
710 (377) 0.04
8
3% Cu, 17% Zn, Polished
530 (277) 0.03
Matte 68 (20) 0.07
Burnished to Brown Colour 68 (20) 0.4
Cu-Zn, Brass Oxidised 392 (200) 0.61
Cu-Zn, Brass Oxidised 752 (400) 0.6
Cu-Zn, Brass Oxidised 1112 (600) 0.61
Unoxidised 77 (25) 0.04
Unoxidised 212 (100) 0.04
Cadmium 77 (25) 0.02
Carbon
Lampblack 77 (25) 0.95
Unoxidised 77 (25) 0.81
Unoxidised 212 (100) 0.81
Unoxidised 932 (500) 0.79
Candle Soot 250 (121) 0.95
Filament 500 (260) 0.95
Graphitized 212 (100) 0.76
Graphitized 572 (300) 0.75
Graphitized 932 (500) 0.71
Temp F˚ (C˚)
Emissivity
Chromium
100 (38) 0.08
1000 (538) 0.26
Chromium, Polished
302 (150) 0.06
Cobalt, Unoxidised
932 (500) 0.13
1832 (1000) 0.23
Columbium, Unoxidised
1500 (816) 0.19
2000 (1093) 0.24
Copper
Cuprous Oxide 100 (38) 0.87
Cuprous Oxide 500 (260) 0.83
Cuprous Oxide 1000 (538) 0.77
Black, Oxidised 100 (38) 0.78
Etched 100 (38) 0.09
Matte 100 (38) 0.22
Roughly Polished 100 (38) 0.07
Polished 100 (38) 0.03
Highly Polished 100 (38) 0.02
Rolled 100 (38) 0.64
Rough 100 (38) 0.74
Molten 1000 (538) 0.15
Molten 1970 (1077) 0.16
Molten 2230 (1221) 0.13
Nickel Plated 100-500
(38-260)
0.37
Dow Metal
0.4-600
(-18-316)
0.15
Gold
Enamel 212 (100) 0.37
Plate on
.0005 Silver
200-750
(93-399)
.11-.14
Plate on
.0005 Nickel
200-750
(93-399)
.07-.09
Polished 100-500
(38-260)
0.02
Polished 1000-2000
(538-1093)
0.03
Haynes Alloy C,
Oxidised 600-2000
(316-1093)
.90-.96
Haynes Alloy 25,
Oxidised 600-2000
(316-1093)
.86-.89
Haynes Alloy X,
Oxidised 600-2000
(316-1093)
.85-.88
Inconel Sheet
1000 (538) 0.28
1200 (649) 0.42
1400 (760) 0.58
Inconel X, Polished
75 (24) 0.19
Inconel B, Polished
75 (24) 0.21
Iron
Oxidised 212 (100) 0.74
Oxidised 930 (499) 0.84
Oxidised 2190 (1199) 0.89
Unoxidised 212 (100) 0.05
Red Rust 77 (25) 0.7
Rusted 77 (25) 0.65
Liquid 2760-3220
(1516-1771)
.42-.45
Temp F˚ (C˚)
Emissivity
Cast Iron
Oxidised 390 (199) 0.64
Oxidised 1110 (599) 0.78
Unoxidised 212 (100) 0.21
Strong Oxidation 40 (104) 0.95
Strong Oxidation 482 (250) 0.95
Liquid 2795 (1535) 0.29
Wrought Iron
Dull 77 (25) 0.94
Dull 660 (349) 0.94
Smooth 100 (38) 0.35
Polished 100 (38) 0.28
Lead
Polished 100-500
(38-260)
.06-.08
Rough 100 (38) 0.43
Oxidised 100 (38) 0.43
Oxidised at 1100 100 (38) 0.63
Gray Oxidised 100 (38) 0.28
Magnesium
100-500
(38-260)
.07-.13
Magnesium Oxide
1880-3140
(1027-1727)
.16-.20
Mercury
32 (0) 0.09
77 (25) 0.1
100 (38) 0.1
212 (100) 0.12
Molybdenum
100 (38) 0.06
500 (260) 0.08
1000 (538) 0.11
2000 (1093) 0.18
Monel, Ni-Cu
392 (200) 0.41
752 (400) 0.44
1112 (600) 0.46
Monel, Ni-Cu Oxidised
68 (20) 0.43
Monel, Ni-Cu Oxid. at 1110degF
1110 (599) 0.46
Nickel
Polished 100 (38) 0.05
Oxidised 100-500
(38-260)
.31-.46
Unoxidised 77 (25) 0.05
Unoxidised 212 (100) 0.06
Unoxidised 932 (500) 0.12
Unoxidised 1832 (1000) 0.19
Electrolytic 100 (38) 0.04
Electrolytic 500 (260) 0.06
Electrolytic 1000 (538) 0.1
Electrolytic 2000 (1093) 0.16
Nickel Oxide
1000-2000
(538-1093)
.59-.86
Palladium Plate (.00005 on .0005 silver)
200-750
(93-399)
.16-.17
Platinum
100 (38) 0.05
500 (260) 0.05
1000 (538) 0.1
EMISSIVITY CHART
Non-Metal and
Metal Materials
METAL MATERIALS