One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly made up of borosilicate glass, a fabric renowned for its low thermal growth coefficient and chemical inertness. The chemical make-up generally contains silica (SiO₂, fifty-ninety%), alumina (Al₂... https://500px.com/photo/1117584688/boride-powder-by-okok-okok