Emissivity Table
Since the
emissivity of a material will vary as a function of temperature and surface
finish, the values in this table should be used only as a guide for
relative or delta measurements. The exact emissivity of a material should be
determined when absolute measurements are required.
| Material |
°F |
°C |
EMS |
| METALS |
ALLOYS:
20~Ni, 24~CR,
55~FE, Oxid. |
392 |
200 |
.9 |
| 20~Ni,
24~CR, 55~FE, Oxid. |
932 |
500 |
.97 |
| 60~Ni
, 12~CR, 28~FE, |
518 |
270 |
.89 |
| 60~Ni
, 12~CR, 28~FE,. |
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 |
| ALUMINUM:
Unoxidized |
77 |
25 |
.02 |
| Unoxidized |
212 |
100 |
.03 |
| Unoxidized |
932 |
500 |
.06 |
| Oxidized |
390 |
199 |
.11 |
| Oxidized |
1110 |
599 |
.19 |
| Oxidized
at 599°C |
390 |
199 |
.2 |
| Oxidized
at 599°C |
1110 |
599 |
.31 |
| Heavily
Oxidized |
200 |
93 |
.09 |
| Heavily
Oxidized |
940 |
504 |
.18 |
| Highly
Polished |
212 |
100 |
.09 |
| Roughly
Polished |
212 |
100 |
.04 |
| Commercial
Sheet |
212 |
100 |
.06 |
| Highly
Polished Plate |
440 |
227 |
.04 |
| Highly
Polished Plate |
1070 |
577 |
.05 |
| Bright
Rolled Plate |
338 |
170 |
.04 |
| Bright
Rolled Plate |
932 |
500 |
.05 |
| Alloy
A3003, Oxidized |
600 |
316 |
.4 |
| Alloy
A3003, Oxidized |
900 |
482 |
.4 |
| 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 |
| Alloy
75ST, Polished |
176 |
80 |
.34 |
| Bismuth,
Unoxidized |
77 |
25 |
.05 |
| Bismuth,
Unoxidized |
212 |
100 |
.06 |
| 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 |
| MATT |
68 |
20 |
.07 |
| Burnished
to Brown Colour |
68 |
20 |
.4 |
| Cu~Zn,
Brass Oxidized |
392 |
200 |
.61 |
| Cu~Zn,
Brass Oxidized |
752 |
400 |
.6 |
| Cu~Zn,
Brass Oxidized |
1112 |
600 |
.61 |
| Unoxidized |
77 |
25 |
.04 |
| Unoxidized |
212 |
100 |
.04 |
| Cadmium |
77 |
25 |
.02 |
| 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 |
| Chromium |
100 |
38 |
.08 |
| Chromium |
1000 |
538 |
.26 |
| Chromium,
Polished |
302 |
150 |
.06 |
| Cobalt,
Unoxidized |
932 |
500 |
.13 |
| Cobalt,
Unoxidized |
1832 |
1000 |
.23 |
| Columbium,
Unoxidized |
1500 |
816 |
.19 |
| Columbium,
Unoxidized |
2000 |
1093 |
.24 |
| 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 |
| Dow
Metal |
.4~600 |
~334 |
.15 |
| GOLD:
Enamel |
212 |
100 |
.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 |
.02 |
| Polished |
1000~2000 |
538~1093 |
.03 |
| 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~.89 |
| Inconel
Sheet |
1000 |
538 |
.28 |
| Inconel
Sheet |
1200 |
649 |
.42 |
| Inconel
Sheet |
1400 |
760 |
.58 |
| Inconel
X, Polished |
75 |
24 |
.19 |
| Inconel
B, Polished |
75 |
24 |
.21 |
| IRON:
Oxidized |
212 |
100 |
.74 |
| Oxidized |
930 |
499 |
.84 |
| Oxidized |
2190 |
1199 |
.89 |
| Unoxidized |
212 |
100 |
.05 |
| Red
Rust |
77 |
25 |
.7 |
| Rusted |
77 |
25 |
.65 |
| Liquid |
2760~3220 |
1516~1771 |
.42~.45 |
| CAST
IRON: Oxidized |
390 |
199 |
.64 |
| Oxidized |
1110 |
599 |
.78 |
| Oxidized |
212 |
100 |
.21 |
| Strong
Oxidation |
40 |
104 |
.95 |
| Strong
Oxidation |
482 |
250 |
.95 |
| Liquid |
2795 |
1535 |
.29 |
| WROUGHT
IRON: Dull |
77 |
25 |
.29 |
| Dull |
660 |
349 |
.94 |
| Smooth |
100 |
38 |
.94 |
| Polished |
100 |
38 |
.35 |
| LEAD:
Polished |
100~500 |
38~260 |
.28 |
| Rough |
100 |
38 |
.07~.13 |
| Oxidized |
100 |
38 |
.16~.20 |
| Oxidized
at 1100°F |
100 |
38 |
.9 |
| Gray
Oxidized |
100 |
38 |
.1 |
| Magnesium |
100~500 |
38~260 |
.1 |
| Magnesium
Oxide |
1880~3140 |
1027~1727 |
.12 |
| Mercury |
32 |
0 |
.09 |
| " |
77 |
25 |
.1 |
| " |
100 |
38 |
.1 |
| " |
212 |
100 |
.12 |
| "
Oxidized at 1000°F |
600 |
316 |
.8 |
| "
Oxidized at 1000°F |
700 |
371 |
.84 |
| "
Oxidized at 1000°F |
800 |
427 |
.84 |
| "
Oxidized at 1000°F |
900 |
482 |
.83 |
| "
Oxidized at 1000°F |
1000 |
538 |
.82 |
| Monel,
Ni~Cu |
392 |
200 |
.41 |
| Monel,
Ni~Cu |
752 |
400 |
.44 |
| Monel,
Ni~Cu |
1112 |
600 |
.46 |
| Monel,
Ni~Cu Oxidized |
68 |
20 |
.43 |
| Monel,
Ni~Cu Oxid. at 1110°F |
1110 |
599 |
.46 |
| NICKEL:
Polished |
| |
