Note: Because the emissivity of a given material will vary with temperature and surface finish, the value in these tables should be used only as a guide for relative or differential temperature measurements. The exact emissivity of a material should be determined when high accuracy is required.
Metals Index


METALS
MATERIAL TEMP °F (°C) e-EMISSIVITY
Alloys
20-Ni, 24-CR, 55-FE, Oxidized  392 (200) .90
20-Ni, 24-CR, 55-FE, Oxidized  932 (500) .97
60-Ni, 12-CR, 28-FE, Oxidized  518 (270) .89
60-Ni, 12-CR, 28-FE, Oxidized  1040 (560) .82
80-Ni, 20-CR, Oxidized  212 (100) .87
80-Ni, 20-CR, Oxidized  1112 (600) .87
80-Ni, 20-CR, Oxidized  2372 (1300) .89
MATERIAL TEMP °F (°C) e-EMISSIVITY
Aluminium
Unoxidized 77 (25) .02
Unoxidized 212 (100) .03
Unoxidized 932 (500) .06
Oxidized 390 (199) .11
Oxidized 1110 (599) .19
Oxidized at 1110F (599C) 390 (199) .11
Oxidized at 1110F (599C) 1110 (599) .19
Heavily Oxidized 200 (93) .20
Heavily Oxidized 940 (504) .31
Highly Polished 212 (100) .09
Roughly Polished 212 (100) .18
Commercial Sheet 212 (100) .09
Highly Polished Plate 440 (227) .04
Highly Polished Plate 1070 (577) .06
Bright Rolled Plate 338 (170) .04
Bright Rolled Plate 932 (500) .05
Alloy A3003, Oxidized 600 (316) .40
Alloy A3003, Oxidized 900 (482) .40
Alloy 1100-0 200-800 (93-427) .05
Alloy 24ST 75 (24) .09
Alloy 24ST, Polished 75 (24) .09
Alloy 75ST 75 (24) .11
Alloy 75ST, Polished 75 (24) .08
MATERIAL TEMP °F (°C) e-EMISSIVITY
Bismuth
Bright 176 (80) .34
Unoxidized 77 (25) .05
Unoxidized 212 (100) .06
MATERIAL TEMP °F (°C) e-EMISSIVITY
Brass
73% Cu, 27% Zn, Polished 476 (247) .03
73% Cu, 27% Zn, Polished 674 (357) .03
62% Cu, 37% Zn, Polished 494 (257) .03
62% Cu, 37% Zn, Polished 710 (377) .04
83% Cu, 17% Zn, Polished 530 (277) .03
Matte 68 (20) .07
Burnished to Brown Color 68 (20) .40
Cu-Zn, Brass Oxidized 392 (200) .61
Cu-Zn, Brass Oxidized 752 (400) .60
Cu-Zn, Brass Oxidized 1112 (600) .61
Unoxidized 77 (25) .04
Unoxidized 212 (100) .04
MATERIAL TEMP °F (°C) e-EMISSIVITY
Cadmium 77 (25) .02
MATERIAL TEMP °F (°C) e-EMISSIVITY
Carbon
Lampblack 77 (25) .95
Unoxidized 77 (25) .81
Unoxidized 212 (100) .81
Unoxidized 932 (500) .79
Candle Soot 250 (121) .95
Filament 500 (260) .95
Graphitized 212 (100) .76
Graphitized 572 (300) .75
Graphitized 932 (500) .71
MATERIAL TEMP °F (°C) e-EMISSIVITY
Chromium 100 (38) .08
Chromium 1000 (538) .26
Chromium, Polished 302 (150) .06
Cobalt, Unoxidized 932 (500) .13
Cobalt, Unoxidized 1832 (1000) .23
MATERIAL TEMP °F (°C) e-EMISSIVITY
Columbium
Unoxidized 1500 (816) .19
Unoxidized 2000 (1093) .24
MATERIAL TEMP °F (°C) e-EMISSIVITY
Copper
Cuprous Oxide 100 (38) .87
Cuprous Oxide 500 (260) .83
Cuprous Oxide 1000 (538) .77
Black, Oxidized 100 (38) .78
Etched 100 (38) .09
Matte 100 (38) .22
Roughly Polished 100 (38) .07
Polished 100 (38) .03
Highly Polished 100 (38) .02
Rolled 100 (38) .64
Rough 100 (38) .74
Molten 1000 (538) .15
Molten 1970 (1077) .16
Molten 2230 (1221) .13
Nickel Plated 100-500 (38-260) .37
MATERIAL TEMP °F (°C) e-EMISSIVITY
Dow Metal 0.4-600 (-18-316) .15
MATERIAL TEMP °F (°C) e-EMISSIVITY
Gold
Enamel 212 (100) .37
Plate(.0001)
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) .02
Polished 1000-2000 (538-1093) .03
MATERIAL TEMP °F (°C) e-EMISSIVITY
Haynes Alloy C
Oxidized 600 2000 (316-1093) .90-.96
Haynes Alloy 25
Oxidized 600-2000 (316-1093) .86-.89
Haynes Alloy X
Oxidized 600-2000 (316-1093) .85-.88
MATERIAL TEMP °F (°C) e-EMISSIVITY
Inconel
Sheet 1000 (538) .28
Sheet 1200 (649) .42
Sheet 1400 (760) .58
X, Polished 75 (24) .19
B, Polished 75 (24) .21
MATERIAL TEMP °F (°C) e-EMISSIVITY
Iron
Oxidized 212 (100) .74
Oxidized 930 (499) .84
Oxidized 2190 (1199) .89
Unoxidized 212 (100) .05
Red Rust 77 (25) .70
Rusted 77 (25) .65
Liquid 2700-3220 (1516-1771) .42-.45
MATERIAL TEMP °F (°C) e-EMISSIVITY
Iron, Cast
Oxidized 390 (199) .64
Oxidized 1110 (599) .78
Unoxidized 212 (100) .21
Strong Oxidation 40 (104) .95
Strong Oxidation 482 (250) .95
Liquid 2795 (1535) .29
MATERIAL TEMP °F (°C) e-EMISSIVITY
Iron, Wrought
Dull 77 (25) .94
Dull 660 (349) .94
Smooth 100 (38) .35
Polished 100 (38) .28
Lead
Polished 100-500 (38-260) .06-.08
Rough 100 (38) .43
Oxidized 100 (38) .43
Oxidized at 1100F 100 (38) .63
Gray Oxidized 100 (38) .28
MATERIAL TEMP °F (°C) e-EMISSIVITY
Magnesium 100-500 (38-260) .07-.13
MATERIAL TEMP °F (°C) e-EMISSIVITY
Magnesium Oxide 1880-3140 (1027-1727) .16-.20
MATERIAL TEMP °F (°C) e-EMISSIVITY
Mercury 32 (0) .09
Mercury 77 (25) .10
Mercury 100 (38) .10
Mercury 212 (100) .12
MATERIAL TEMP °F (°C) e-EMISSIVITY
Molybdenum 100 (38) .06
Molybdenum 500 (260) .08
Molybdenum 1000 (538) .11
Molybdenum 2000 (1093 .18
Oxidized at 1000F 600 (316) .80
Oxidized at 1000F 700 (371) .84
Oxidized at 1000F 800 (427) .84
Oxidized at 1000F 900 (482) .83
Oxidized at 1000F 1000 (538) .82
MATERIAL TEMP °F (°C) e-EMISSIVITY
Monel
Monel, Ni-Cu 392 (200 .41
Monel, Ni-Cu 752 (400) .44
Monel, Ni-Cu 1112 (600) .46
Oxidized 68 (20) .43
Oxidized at 1110F 1110 (599) .46
MATERIAL TEMP °F (°C) e-EMISSIVITY
Nickel
Polished 100 (38) .05
Oxidized 100-500 (38-260) .31-.46
Unoxidized 77 (25) .05
Unoxidized 212 (100) .06
Unoxidized 932 (500) .12
Unoxidized 1832 (1000) .19
Electrolytic 100 (38) .04
Electrolytic 500 (260) .06
Electrolytic 1000 (538) .10
Electrolytic 2000 (1093) .16
MATERIAL TEMP °F (°C) e-EMISSIVITY
Nickel Oxide 1000-2000 (538-1093) .59-.86
MATERIAL TEMP °F (°C) e-EMISSIVITY
Palladium Plate
Nickel (.00005 on .0005 silver) 200-750 (93-399) .16-.17
MATERIAL TEMP °F (°C) e-EMISSIVITY
Platinum
Platinum 500 (260) .05
Platinum 1000 (538) .10
MATERIAL TEMP °F (°C) e-EMISSIVITY
Platinum, Black 100 (38) .93
Platinum, Black 500 (260) .96
Platinum, Black 2000 (1093) .97
Oxidized at 1100F (593C) 500 (260) .07
Oxidized at 1100F (593C) 1000 (538) .11
MATERIAL TEMP °F (°C) e-EMISSIVITY
Rhodium Flash (0.0002 on
0.0005Ni) 200-700 (93-371) .10-.18
MATERIAL TEMP °F (°C) e-EMISSIVITY
Silver
Plate (0.0005 on Ni) 200-700 (93-371) .06-.07
Polished 100 (38) .01
Polished 500 (260) .02
Polished 1000 (538) .03
Polished 2000 (1093) .03
MATERIAL TEMP °F (°C) e-EMISSIVITY
Steel
Cold Rolled 200 (93) .75-.85
Ground Sheet 1720-2010 (938-1099) .55-.61
Polished Sheet 100 (38) .07
Polished Sheet 500 (260) .10
Polished Sheet 1000 (538) .14
Mild Steel, Polished 75 (24) .10
Mild Steel, Smooth 75 (24) .12
Mild Steel, Liquid 2910-3270 (1599-1793) .28
Steel, Unoxidized 212 (100) .08
Steel Oxidized 77 (25) .80
MATERIAL TEMP °F (°C) e-EMISSIVITY
Steel Alloys
Type 301, Polished 75 (24) .27
Type 301, Polished 450 (232) .57
Type 301, Polished 1740 (949) .55
Type 303, Oxidized 600-2000 (316-1093) .74-.87
Type 310, Rolled 1500-2100 ((816-1149) .56-.81
Type 316, Polished 75 (24) .28
Type 316, Polished 450 (232) .57
Type 316, Polished 1740 (949) .66
Type 321 200-800 (93-427) .27-.32
Type 321, Polished 300-1500 (149-815) .18-.49
Type 321 w/BK Oxide 200-800 (93-427) .66-.76
Type 347, Oxidized 600-2000 (316-1093) .87-.91
Type 350 200-800 (93-427) .18-.27
Type 350 Polished 300-1800 (149-982) .11-.35
Type 446, Polished 300-1500 (149-815) .15-.37
Type 17-7 PH 200-600 (93-316) .44-.51
Type 17-7 PH Polished 300-1500 (149-815) .09-.16
Type C1020, Oxidized 600-2000 (316-1093) .87-.91
Type PH-15-7 MO 300-1200 (149-649) .07-.19
Stellite, Polished 68 (20) .18
MATERIAL TEMP °F (°C) e-EMISSIVITY
Tantalum
Unoxidized 1340 (727) .14
Unoxidized 2000 (1093) .19
Unoxidized 3600 (1982) .26
Unoxidized 5306 (2930) .30
MATERIAL TEMP °F (°C) e-EMISSIVITY
Tin
Unoxidized 77 (25) .04
Unoxidized 212 (100) .05
Tinned Iron, Bright 76 (24) .05
Tinned Iron, Bright 212 (100) .08
MATERIAL TEMP °F (°C) e-EMISSIVITY
Titanium
Alloy C110M, Polished 300-1200 (149-649) .08-.19
Alloy C110M, Oxidized at 1000F (538C) 200-800 (93-427) .51-.61
Alloy Ti-95A, Oxidized at 1000F (538C) 200-800 (93-427) .35-.48
Anodized onto SS 200-600 (93-316) .96-.82
MATERIAL TEMP °F (°C) e-EMISSIVITY
Monel
Unoxidized 77 (25) .02
Unoxidized 212 (100) .03
Unoxidized 932 (500) .07
Unoxidized 1832 (1000) .15
Unoxidized 2732 (1500) .23
Unoxidized 3632 (2000) .28
Filament (Aged) 100 (38) .03
Filament (Aged) 1000 (538) .11
Filament (Aged) 5000 (2760) .35
MATERIAL TEMP °F (°C) e-EMISSIVITY
Uranium Oxide 1880 (1027) .79
MATERIAL TEMP °F (°C) e-EMISSIVITY
Zinc
Bright, Galvanized 100 (38) .23
Commercial 99.1% 500 (260) .05
Galvanized 100 (38) .28
Oxidized 500-1000 (260-538) .11
Polished 100 (38) .02
Polished 500 (260) .03
Polished 1000 (538) .04
Polished 2000 (1093) .06
 
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