One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely made up of borosilicate glass, a fabric renowned for its reduced thermal growth coefficient and chemical inertness. The chemical makeup commonly involves silica (SiO₂, fifty-90%), alumina (Al₂O₃,... https://www.pearltrees.com/okok5/item753855462