1. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure 1.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are principally composed of borosilicate glass, a fabric renowned for its minimal thermal expansion coefficient and chemical inertness. The chemical makeup usually involves silica (SiO₂, fifty-ninety%), alumina ... http://www.mysportsgo.com/profile/okok0972/action_id/1516636/show_comments/1