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7.2 Typical Emissivity Values
The following table provides a brief reference guide for determining
emissivity and can be used when one of the above methods is not
practical. Emissivity values shown in the table are only approximate,
since several parameters may affect the emissivity of a material.
These include the following:
1.
Temperature
2.
Angle of measurement
3.
Geometry (plane, concave, convex)
4.
Thickness
5.
Surface quality (polished, rough, oxidized, sandblasted)
6.
Spectral range of measurement
7.
Transmission (e.g. thin films plastics)
GP Series
Rev. F 10/2011
Appendix
61
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