1. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly made up of borosilicate glass, a material renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up normally consists of silica (SiO₂, fifty-ninety%), alumina (A... https://500px.com/photo/1117584681/elementary-by-okok-okok