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 cloth renowned for its lower thermal expansion coefficient and chemical inertness. The chemical makeup ordinarily incorporates silica (SiO₂, fifty-90%), alumina... https://500px.com/photo/1117584688/boride-powder-by-okok-okok