One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are generally composed of borosilicate glass, a fabric renowned for its reduced thermal growth coefficient and chemical inertness. The chemical make-up generally consists of silica (SiO₂, fifty-ninety%), a... http://myworldgo.com/profile/okok0972/action_id/3410029/show_comments/1