1. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure one.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are generally made up of borosilicate glass, a material renowned for its reduced thermal expansion coefficient and chemical inertness. The chemical make-up commonly incorporates silica (SiO₂, 50-ninety%), alum... https://www.pearltrees.com/okok5/item753855462