1. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are primarily made up of borosilicate glass, a material renowned for its very low thermal expansion coefficient and chemical inertness. The chemical makeup usually includes silica (SiO₂, 50-ninety%), alumina... https://padlet.com/okok0972149980/okok093-p57jo614mu84dt15/wish/0BA3ZpGApr7zQnPb