One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly made up of borosilicate glass, a material renowned for its lower thermal expansion coefficient and chemical inertness. The chemical makeup ordinarily incorporates silica (SiO₂, 50-90%), alumina ... https://www.scoop.it/topic/okok0972/p/4168402012/2025/10/14/how-is-calcium-stearate-powder-s-molecular-framework-engineered