optris Bottom-Up GIS 450i G7, Operator'S Manual

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For devices with a wavelength range of 5.0 µm (G5) or 7.9 µm (G7)
the emissivity ε is > 0.90 and
there is a low angular dependence of the reflectivity ρ
Figure 31:
Representation of the emissivity over the wavelength for different glass types
The figure shows how the dependence of the emissivity of different types of glass behaves with respect to
the wavelength. A good emissivity is present in the wavelength range 5.0 µm and 7.9 µm and is preferred for
measurements on glass.