One. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly made up of borosilicate glass, a fabric renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up normally consists of silica (SiO₂, fifty-ninety%), alumina (Al₂O₃, https://www.vevioz.com/post/1845455_trunnano-focuses-on-providing-a-full-range-of-high-quality-3d-printing-powders-t.html