This research aims to establish relationships between microstructural properties of titanium dioxide (TiO2) coatings applied to hollow glass microspheres (HGMs). Specifically, the research seeks to develop a reliable coating technique and analyze properties such as thickness, mechanical stability, and pore structure. Samples were fabricated with thin and thick coatings and analyzed using methods like SEM, XRD, and gas adsorption. Results showed relationships between coating thickness and pore volume as well as between annealing temperature and average pore size or surface area. Fissuring was observed in thicker coatings annealed at higher temperatures.