We are able to measure glass emissivity according to EN 12898:2019, with the PerkinElmer Spectrum Two FTIR spectrometer and PIKE 10Spec 10-degree specular reflection accessory.
The total normal emissivity (εn) result is reported. The corrected emissivity (ε) is calculated and presented in the appendix. For glass U-value calculation, the corrected emissivity should be used.