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Material
Asbestos
Asphalt
Basalt
Carbon
Unoxidized
Graphite
Carborundum
Ceramic
Clay
Concrete
Cloth
Glass
Plate
"Gob"
Gravel
Gypsum
Ice
Limestone
Paint (non-al.)
Paper (any color)
Plastic, opaque at 500 µm
thickness (20 mils)
Rubber
Sand
Snow
Soil
Water
Wood, Natural
To optimize surface temperature measurements, consider the following guidelines:
Determine the object emissivity using the instrument which is also to be used for the
measurements.
Avoid reflections by shielding the object from surrounding temperature sources.
For higher temperature objects use instruments with the shortest wavelength possible.
For translucent materials such as plastic foils or glass, assure that the background is uniform
and lower in temperature than the object.
Mount the sensor perpendicular to surface whenever emissivity is less than 0.9. In all cases, do
not exceed angles more than 30 degrees from incidence.
Pi20
N
-M
ON
ETALS
Emissivity
8 – 14 µm
0.95
0.95
0.7
0.8-0.9
0.7-0.8
0.9
0.95
0.95
0.95
0.95
0.85
0.95
0.8-0.95
0.98
0.98
0.9-0.95
0.95
0.95
0.95
0.9
0.9
0.9-0.98
0.93
0.9-0.95
Table 2: Typical Emissivity Values
Rev. B 09/2011
Appendix
53
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