One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure one.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are generally composed of borosilicate glass, a cloth renowned for its minimal thermal enlargement coefficient and chemical inertness. The chemical make-up usually contains silica (SiO₂, fifty-ninety%), ... http://www.mysportsgo.com/profile/okok0972/action_id/1516636/show_comments/1