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INF200-MAN P. 6

Emissivity Va l u e s

*Emissivity various with purity.

Typical Emissivity Values - Non-Metals

Surface Emissivity

Refractory & Building Materials

Red brick 0.75 to 0.9

Fire clay 0.75

Asbestos 0.95

Concrete 0.7

Marble 0.9

Carborundum 0.85

Plaster 0.9

Alumina (fine grain) 0.25

Alumina (coarse grain) 0.45

Silica (fine grain) 0.4

Silica (coarse grain) 0.55

Zirconium silicate up to 500˚C 0.85

Zirconium silicate at 850˚C 0.6

Quartz (rough) 0.9

Carbon (graphite) 0.75

Carbon (soot) 0.95

Timber (various) 0.8 to 0.9

Miscellaneous

Enamel (any color) 0.9

Oil paint (any color) 0.95

Lacquer 0.9

Matte black paint 0.95 to 0.98

Aluminum lacquer 0.5

Water 0.98

Rubber (smooth) 0.9

Rubber (rough) 0.98

Plastics (various, solid) 0.8 to 0.95

Plastic films (.05 mm thick) 0.5 to 0.95

Polythene film (.03 mm thick) 0.2 to 0.3

Paper and cardboard 0.9

Silicone polish (.03 mm thick) 0.7

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