One. Scientific Foundations of Hollow Glass Microspheres 1.1 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 expansion coefficient and chemical inertness. The chemical make-up commonly includes silica (SiO₂, fifty-90%), alumina (... https://expressafrica.net/post/401199_trunnano-focuses-on-providing-a-full-range-of-high-quality-3d-printing-powders-t.html