To seek a valorization for waste glasses from healthcare facilities in the production of functional glass ceramics. This research was conducted by investigate the effect of MgO addition, and examine the impact of varying sintering temperatures rates on both the phase formation and physical characteristics of glass ceramics prepared for dielectric applications. These wastes are mainly used as a source of silica, and according to the chemistry of glasses, molar mixtures were established, deficits in magnesia (MgO) offset by addition of pure magnesium oxide. 25,30 and 35 mol % of MgO were added to glass waste to prepare the new glasses samples which were exposed to three sintering temperatures rates 2°C/min , 5°C/min 10°C/min , the development of structures was characterized using Raman spectroscopy, X-ray diffraction (XRD), differential thermal analysis (DSC/TG) and scanning electron microscopy (SEM). Some physical properties include density, porosity; hardness, and thermal expansion coefficient of the samples were measured .Results indicate that the formation of forsterite starts in the surface at 850°C and gradually increases as the amount of magnesia rises up 30 mol %, leading to an increase in the phase content in the volume. This significantly alters the evolution of the measured values of the dielectric constant. Furthermore, it has highly intriguing dielectric characteristics. Due to these factors, the use of glass ceramics based forsterite may prove to be very promising for the development of high-frequency dielectric devices.