1. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely made up of borosilicate glass, a fabric renowned for its low thermal growth coefficient and chemical inertness. The chemical make-up commonly involves silica (SiO₂, fifty-90%), alumina (Al₂O₃, 10... http://www.mysportsgo.com/profile/okok0972/action_id/1516636/show_comments/1