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 fabric renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up normally features silica (SiO₂, 50-ninety%), alumina (Al₂O₃, ... https://500px.com/photo/1117584688/boride-powder-by-okok-okok