1. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure one.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly 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%), alumina ... https://padlet.com/okok0972149980/okok093-p57jo614mu84dt15/wish/yEPVZknVzz02Qb0Y