NFRC 301-2004: Standard Test Method for Emittance of Specular Surfaces Using Spectrometric Measurements(Downloadable in PDF Format )
“1 Scope”

“This test method determines the normal and hemispherical emittance of a specular
surface. This test method describes the spectrometric measurement of the near-normal
specular reflectance in the mid-infrared range from mid-infrared 5 to 25 um. It includes
the calculation procedures required to determine the normal and hemispherical
emittance of said object.

This test method includes calibration instructions for the spectrometer and procedures
for selecting reflectance-reference standards.”…

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