One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure one.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are generally made up of borosilicate glass, a fabric renowned for its minimal thermal enlargement coefficient and chemical inertness. The chemical make-up ordinarily contains silica (SiO₂, fifty-90%), alu... https://www.pearltrees.com/okok5/item753855454