One. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly made up of borosilicate glass, a material renowned for its small thermal expansion coefficient and chemical inertness. The chemical make-up normally contains silica (SiO₂, fifty-ninety%), alumina ... https://d6united.mn.co/posts/92164868