Appendix C
Typical Emissivity Values
The following tables provide references for estimating emissivity and can be used when the user does not have the means or the time to determine the emissivity value experimentally. Emissivity values shown in the tables are only approximate. Any or all of the following parameters can affect the emissivity of an object:
•Temperature
•Angle of measurement
•Geometry (plane, concave, convex, etc.)
•Thickness
•Surface quality (polished, rough, oxidized, sandblasted)
•Spectral region of measurement
•Transmissivity (i.e., thin film plastics)
Note
These following tables are to be used as a guide only, as emissivity changes with temperature, viewing angle, wavelength, target geometry and surface finish.
