Emissivity
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| DESCRIPTION |
COMPOSITION
|
TEMPERATURE (K)
|
EMISSIVITY
(E) |
| Aluminum oxide |
(n)
|
600
|
0.69
|
|
|
1000
|
0.55
|
|
|
|
1500
|
0.41
|
|
| Asphalt pavement |
(h)
|
300
|
0.85-0.93
|
| Building materials |
|
|
|
| Asbestos sheet |
(h)
|
300
|
0.93-0.96
|
| Brick, red |
(h)
|
300
|
0.93-0.96
|
| Gypsum or plaster board |
(h)
|
|
|
| Wood |
(h)
|
300
|
0.82-0.92
|
| Cloth |
(h)
|
300
|
0.75-0.90
|
| Concrete |
(h)
|
300
|
0.88-0.93
|
| Glass, window |
(h)
|
300
|
0.90-0.95
|
| Ice |
(h)
|
273
|
0.95-0.98
|
| Paints |
|
|
|
| Black (Parsons) |
(h)
|
300
|
0.98
|
| White, acrylic |
(h)
|
300
|
0.90
|
| White, zinc oxide |
(h)
|
300
|
0.92
|
| Paper, white |
(h)
|
300
|
0.92-0.97
|
| Pyrex |
(n)
|
300
|
0.82
|
|
|
600
|
0.80
|
|
|
|
1000
|
0.71
|
|
|
|
1200
|
0.62
|
|
| Pyroceram |
(n)
|
300
|
0.85
|
|
|
600
|
0.78
|
|
|
|
1000
|
0.69
|
|
|
|
1500
|
0.57
|
|
| Refractories (furnace liners) |
|
|
|
| Alumina brick |
(n)
|
800
|
0.40
|
|
|
1000
|
0.33
|
|
|
|
1400
|
0.28
|
|
|
|
1600
|
0.33
|
|
| Magnesia brick |
(n)
|
800
|
0.45
|
|
|
1000
|
0.36
|
|
|
|
1400
|
0.31
|
|
|
|
1600
|
0.40
|
|
| Kaolin insulating brick |
(n)
|
800
|
0.70
|
|
|
1200
|
0.57
|
|
|
|
1400
|
0.47
|
|
|
|
1600
|
0.53
|
|
| Sand |
(h)
|
300
|
0.90
|
| Silicon carbide |
(n)
|
600
|
0.87
|
|
|
1000
|
0.87
|
|
|
|
1500
|
0.85
|
|
| Skin |
(h)
|
300
|
0.95
|
| Snow |
(h)
|
273
|
0.82-0.90
|
| Soil |
(h)
|
300
|
0.93-0.96
|
| Rocks |
(h)
|
300
|
0.93-0.96
|
| Teflon |
(h)
|
300
|
0.85
|
|
|
400
|
0.87
|
|
|
|
500
|
0.92
|
|
| Vegetation |
(h)
|
300
|
0.92-0.96
|
| Water |
(h)
|
300
|
0.96
|
| Total, normal (n), or hemispherical (h) emissivity of selected surfaces | |||
