One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly made up of borosilicate glass, a material renowned for its very low thermal expansion coefficient and chemical inertness. The chemical makeup typically incorporates silica (SiO₂, 50-90%), alumin... https://sites.google.com/u/0/d/1ddXgp-GnsfUqOaRS3BFWlUN3gzl_cu1v/p/17VZq1QdfhnfMrdo9ZvBkMG_t6KM0zsQF/publishview