1. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure 1.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are principally made up of borosilicate glass, a material renowned for its reduced thermal enlargement coefficient and chemical inertness. The chemical make-up commonly consists of silica (SiO₂, fifty-90%), al... https://demo.jcow.net/images/viewstory/88299