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The knowledge of material properties is an essential step to design particle accelerators and High Energy Colliders. During operation of these machines, the walls of the vacuum chambers are subjected to bombardment of photons and electrons. The detrimental interactions may be followed by issues related to vacuum and beam instability. Hence, it becomes crucial to obtain experimental data about these interaction in conditions as close as possible to the operative ones. Among others properties, Reflectivity (both specular and total component) and photoyield are of particular interest. These data will be used in numerical simulations to design vacuum systems. In an experimental campaign, carried out at the OPTICS beamline of BESSYII, we investigated the Reflectivity and the Photon Yield of technical materials of interest for the High Luminosity LHC upgrade and Future Circular Collider-hh design., CERN Yellow Reports: Conference Proceedings, Vol. 7 (2020): ECLOUD’18 : Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, 3–7 June 2018, La Biodola, Isola d’Elba, Italy